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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Attockicetus ： ウィキペディア英語版 Attockicetus ''Attockicetus'' is an extinct genus of remingtonocetid early whale known from the Middle Eocene (Lutetian) Kuldana Formation in the Kala Chitta Hills, in the Attock District of Punjab, Pakistan. described ''Attockicetus'' based on fragmentary cranial material. Their specimen includes a fragmentary rostrum, an endocast (interior of cranium), and an ectotympanic (ear bone). The specimen also had preserved cheek teeth, P3-M3, which is rare in remingtonocetids. ''Attockicetus'' is primitive in the retention of large protocones on the upper molars and the location of the orbits anteriorly on the skull. It is probably the most plesiomorphic remingtonocetid and the only one found in Pakistan. collected additional dental material at the type locality which they assigned to ''Attockicetus''. Compared to pakicetid teeth found at the same locality, the P3 of ''Attockicetus'' is much lower, angled anteriorly, and has a very long posterior extension. A long diastema separates P3 from P4 and P3 is longer than P4, which Cooper et al. identified as a remingtonocetid character and, because ''Attockicetus'' is the only known remingtonocetid known from the Kala Chitta Hills, they tentatively assigned the specimen as belonging to this genus. The P4 of ''Attockicetus'' is similar to those of ''Pakicetus'' in retaining a tall protoconid (cusp) and anterior and posterior basal extensions with prominent cristae (crests), but differs from them in having steeper protoconid slopes, being taller, and having longer basal extensions. Cooper et al. also noted that the molar wear in pakicetids is typically extensive, whilst the P4 in ''Attockicetus'' is less worn, suggesting that the latter was not used for breaking down food, but for holding prey.〔 ==Notes== 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「Attockicetus」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.