翻訳と辞書 Words near each other ・ Thalassopterus zancleus ・ Thalassosmittia ・ Thalassothemis marchali ・ Thalassotherapy ・ Thalassotrechus ・ Thalastaanam ・ Thalatha ・ Thalatha Atukorale ・ Thalathoides ・ Thalatta ・ Thalatta (Thames barge) ・ Thalatta fasciosa ・ Thalatta! Thalatta! ・ Thalattoarchon ・ Thalattorhynchus ・ Thalattosaur ・ Thalattosauroidea ・ Thalattosaurus ・ Thalattosuchia ・ Thalattu ・ Thalattu Ketkuthamma ・ Thalattu Padava ・ Thalavady ・ Thalavai Sundaram ・ Thalavattam ・ Thalavoi (North) ・ Thalavoi (South) ・ Thalavoor ・ Thalawa Divisional Secretariat ・ Thalawathugoda Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Thalattosaur ： ウィキペディア英語版 Thalattosaur Thalattosaurs (meaning "ocean lizards") are a group of prehistoric marine reptiles that lived during the mid-late Triassic Period. Some species of thalattosaur grew to over 4 metres (13 feet) in length, including a long, flattened tail used in underwater propulsion. While they bore a superficial resemblance to lizards, the exact relationships of thalattosaurs is unknown; they are widely accepted as diapsids, but experts have variously placed them on the reptile family tree near ichthyosaurs, archosaurs, or Lepidosauromorpha (lizards and their relatives), or as basal neodiapsids. ==Description== Thalattosaurs have moderate adaptations to marine lifestyles, including long, paddle-like tails and slender bodies. Primitive features of thalattosaurs include the many teeth covering the palate, single-headed ribs, and broad, plate-like coracoid bones. The most unusual features of thalattosaurs are their snouts. Members of one group, the Askeptosauroidea, have long, narrow, pointed skulls. The extended rostra at the end of the skull push back the nostrils so that they are positioned closer to the eye sockets. Most have small teeth, but one askeptosauroid, ''Endennasaurus'', is entirely toothless. Members of a second group, Thalattosauroidea, have more distinctive downturned snouts. ''Clarazia'' and ''Thalattosaurus'' both have snouts that taper into a narrow tip. Most of the snout is straight, but premaxillae at the tip are downturned. ''Xinpusaurus'' also has downturned premaxillae, but the end of the maxillae are sharply upturned, forming a notch in the skull. In ''Hescheleria'', ''Nectosaurus'', and ''Paralonectes'', the premaxillae are abruptly downturned at the end of the snout, nearly forming a right angle with the rest of the jaw. In these forms, the end of the snout is a toothy hook separated from the rest of the jaw by a space called a diastema. 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「Thalattosaur」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.