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Therizinosauridae
Therizinosauridae ("reaper lizards") is a family of advanced herbivorous or omnivorous theropod dinosaurs. Therizinosaurid fossil remains have been recovered from mid-late Cretaceous Period deposits from Mongolia, China, and the United States.
==Classification==
The family Therizinosauridae was coined by Evgeny Maleev in 1954 to contain the enigmatic ''Therizinosaurus cheloniformis'', which Maleev originally thought to be a species of giant "turtle-like lizard."〔Maleev, E. (1954). "New turtle-like reptile in Mongolia." ''Priroda'', 1954: 106-108.〕 It was long considered a strange, probably carnivorous, species. Relatives of ''Therizinosaurus'' were later found but not recognized as such for some time. These more complete specimens were herbivores, and had a bizarre mixture of what looked to early researchers like a mix between ornithischian and "prosauropod" dinosaurs. Collectively, these were included in the family Segnosauridae, or "slow lizards", due to their heavy bodies, short legs, and presumably slow, ground sloth-like lifestyle.〔Perle, A. (1979). "Segnosauridae—a new family of theropods from the Late Cretaceous of Mongolia." ''Trans. Joint Soviet–Mongolian Palaeontological Expedition'', 8: 45–55.〕 Subsequent studies found that segnosaurids were neither prosauropods nor ornithischians, but actually bizarre theropods, and that the previously enigmatic ''Therizinosaurus'' was also a member of this group. Since the family Therizinosauridae was named earlier than Segnosauridae, the later name became a junior synonym of the former, despite the fact that ''Therizinosaurus'' was a new addition to the segnosaurid group.〔Clark, J. M., Perle, A. & Norell, M. A. (1994). "The skull of ''Erlicosaurus andrewsi'', a Late Cretaceous ‘‘Segnosaur’’ (Theropod: Therizinosauridae) from Mongolia." ''American Museum Novitates'', 3115: 1–39.〕
Therizinosauridae was first given a phylogenetic definition by Paul Sereno in 1998, who defined it as all dinosaurs closer to ''Erlikosaurus'' than to ''Ornithomimus''. As the relationship of therizinosaurids to other theropods clarified and more members of the larger therizinosaur group were found, a more restrictive definition has come to be preferred for the family-level name Therizinosauridae. Sereno himself, for example, re-defined the name in 2005 as the clade containing ''Therizinosaurus cheloniformis'', ''Nothronychus mckinleyi'', and ''Neimongosaurus yangi''.〔Sereno, P. C. 2005. (Stem Archosauria—TaxonSearch ) (1.0, 2005 November 7 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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