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Temnodontosaurus eurycephalus
''Temnodontosaurus eurycephalus'' is an extict species of marine reptile.〔C. McGowan. 1974. A revision of the longipinnate ichthyosaurs of the Lower Jurassic of England, with descriptions of two new species (Reptilia: Ichthyosauria). Life Sciences Contribution of the Royal Ontario Museum 97.〕 It is thought to have been a nektonic carnivore. Its name comes from the Greek ''ευρύς'', for "wide" and ''κεφάλι'' for "head".
==Description==
It is considered a large ichthyosaur, the adult jaw length exceeding the mark. Its snout is relatively short, the ratio between the length of its snout to the length of its jaw being under 0.58. Its skull and lower jaw are deep; the orbit is relatively small, the ratio between the diameter of its orbit to the length of its jaw being lower than 0.21; in turn, the ratio between the internal diameter of its sclerotic ring to the diameter of its orbit is smaller than 0.35. The species maxilla is relatively long, the ratio between the length of its premaxilla to the length of its jaw is less than 0.36. Its naris is short.
Its teeth are few in number, the maxillary tooth count probably standing at below 15. It belongs to the Lower Liassic in age and is probably confined to Lyme Regis, Dorsetshire.〔
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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