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:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).
:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.
''Dasornis'' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.〔Bourdon (2005), Mayr (2009: p.59)〕
Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).〔Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.〕
==Description==
Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).〔Mayr (2008), Clouter ()〕
This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.〔Mayr (2008), ''contra'' Bourdon (2005).〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.'''''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).」の詳細全文を読む
'Dasornis'' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).
:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.
''Dasornis'' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.〔Bourdon (2005), Mayr (2009: p.59)〕
Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).〔Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.〕
==Description==
Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).〔Mayr (2008), Clouter ()〕
This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.〔Mayr (2008), ''contra'' Bourdon (2005).〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.'''''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).」の詳細全文を読む
' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).
:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.
''Dasornis'' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.〔Bourdon (2005), Mayr (2009: p.59)〕
Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).〔Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.〕
==Description==
Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).〔Mayr (2008), Clouter ()〕
This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.〔Mayr (2008), ''contra'' Bourdon (2005).〕
抄文引用元・出典: フリー百科事典『 ''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).">ウィキペディア（Wikipedia）』
■ウィキペディアで「:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.'''''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).」の詳細全文を読む
'Dasornis'' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).">ウィキペディア（Wikipedia）』
■ウィキペディアで「:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.'''''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).」の詳細全文を読む
' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).">ウィキペディア（Wikipedia）』
■''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).">ウィキペディアで「:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.'''''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).」の詳細全文を読む
'Dasornis'' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).">ウィキペディアで「:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.'''''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).」の詳細全文を読む
' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).">ウィキペディアで「:"Neptuniavis"''redirects here. For ''"N." minor'', see ''Odontopteryx.''Dasornis''''' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).」の詳細全文を読む
'Dasornis'' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).」の詳細全文を読む
' is a genus of the prehistoric pseudotooth birds. These were probably rather close relatives of either pelicans and storks, or of waterfowl, and are here placed in the order Odontopterygiformes to account for this uncertainty.Bourdon (2005), Mayr (2009: p.59)Almost all known material of this bird is from some 50 million years ago (Ma) and has been recovered from the Ypresian (Early Eocene) London Clay of the Isle of Sheppey (England). The exception are a few approximately 45 Ma-old remains from the Lutetian (Middle Eocene, MP11-13) of Etterbeek (Belgium) that are only tentatively included here, and some even more conjectural remains from outside Europe (see below).Brodkorb (1963: pp.248-249), Mlíkovský (2002: pp.78,82-83), Mayr (2009: p.56) – see "Systematics and taxonomy" for the misidentifications involved.==Description==Like those of its relatives, the thin-walled bones of ''Dasornis'' broke easily and thus very few fossils – though still far more than of the average pseudotooth bird genus – are in decent condition. Among these is a superbly preserved partial skull that has been of crucial importance in sorting out the convoluted synonymy of this genus. Apart from that and another not quite as well-preserved partial skull, however, a number of beak and cranium pieces as well as a few broken remains of wing and tarsometatarsus bones make up the known remains of ''Dasornis''. The most tell-tale characteristic of the present genus are the combination of Paleogene age and huge size. But given the fragmented state of these, it is not at all clear whether the genus was restricted to the North Atlantic (and perhaps the adjacent Paratethys) or occurred also in the Pacific and in the Southern Hemisphere, where fossils of a similar size were found (see below).Mayr (2008), Clouter ()This genus belongs to the group of huge pseudotooth birds, with wingspans in excess of , and probably as much as . The complete head and bill probably measured almost in life, the eye socket had a diameter of and the humerus at its distal end was about wide. The well-preserved skull fossil shows deep grooves along the underside of the upper bill, with pits to accommodate the lower bill's "teeth". Thus, only the upper "teeth" were visible when the bird closed its bill. ''Dasornis'' resembles the much smaller ''Odontopteryx'' in having a jugal arch that is mid-sized, tapering and stout behind the orbital process of the prefrontal bone, unlike in the large Neogene ''Osteodontornis''. Also, its paroccipital process is much elongated back- and downwards, again like in ''Odontopteryx'' but unlike in ''Pseudodontornis longirostris''. Further traits in which ''Dasornis'' agreed with ''Odontopteryx'' – and differed from ''Pelagornis'' (a contemporary of ''Osteodontornis'') are a deep and long handward-pointing pneumatic foramen in the fossa pneumotricipitalis of the humerus, a latissimus dorsi muscle attachment site on the humerus that consists of two distinct segments instead of a single long, and a large knob that extends along the ulna where the ligamentum collaterale ventrale attached. As the traits as found in ''Odontopteryx'' and ''Dasornis'' are probably plesiomorphic, they cannot be used to argue for a closer relationship between the two Paleogene genera than either had with ''Osteodontornis'' and/or ''Pelagornis''.Mayr (2008), ''contra'' Bourdon (2005).」の詳細全文を読む
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