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Pycnodontiformes is an extinct order of bony fish. The group evolved during the Late Triassic and disappeared during the Eocene. The group has been found in rock formations in Africa, Asia, Europe, North and South America. The pycnodontiforms were small to middle-sized fish, with laterally-compressed body and almost circular outline. Pycnodontiform fishes lived mostly in shallow-water seas. They had special jaws with round and flattened teeth, well adapted to crush food items.〔 One study links the dentine tubules in pycnodont teeth to comparable structures in the dermal denticles of early Paleozoic fish. Some species lived in rivers and possibly fed on molluscs and crustaceans. ==Taxonomy== * †Order Pycnodontiformes (Berg, 1937) * †''Paramesturus * †''Mesturus * †''Micropycnodon * †''Gyrodus * †''Arduafrons * †''Eomesodon * Family †Brembodontidae, Tintori 1981 * * †''Gibbodon * * †''Brembodus *Family †Coccodontidae, Berg, 1940 * * †''Coccodus * * †''Hensodon *Family †Trewavasiidae, Nursall and Capasso 2008〔Nursall and Capasso, Mesozoic Fishes 4 – Homology and Phylogeny, G. Arratia, H.-P. Schultze & M. V. H. Wilson (eds.), Verlag Dr. Friedrich Pfeil, München, Germany 2008 – ISBN 978-3-89937-080-5"Additional specimens from Lebanon reveal more of the structure of the pycnodont fish ''Trewavasia carinata'' (DAVIS, 1887)"〕〔Nursall, Ralph Mesozoic Fishes – Systematics and Paleoecology, G. Arratia & G. Viohl (eds.), Verlag Dr. Friedrich Pfeil, München, Germany, 1996 – ISBN 3-923871-90-2 "The phylogeny of pycnodont fishes"〕 * * †''Trewavasia * * †''Ichthyoceros *Family †Pycnodontidae, Agassiz 1833 * * †''Akromystax * * †''Macromesodon * * †''Stenamara * * †''Stemmatodus * * †''Turbomesodon * * †''Anomoedus * * †''Ocloedus * * †''Tepexichtys * * †''Neoproseinetes * * †''Proscinetes * * †''Tamanja * * †''Potiguara * * †''Coelodus * * †''Pycnodus * * †''Oropycnodus * * †''Nursallia * * †''Abdobalistum * * †''Palaeobalistum 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「Pycnodontiformes」の詳細全文を読む スポンサード リンク
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