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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 Caerorhachis ： ウィキペディア英語版 Caerorhachis ''Caerorhachis'' (meaning "suitable spine" in Greek) is an extinct genus of early tetrapod from the Early Carboniferous of Scotland, probably from the Serpukhovian stage. Its placement within Tetrapoda is uncertain, but it is generally regarded as a primitive member of the group. The type species ''C. bairdi'' was named in 1977. == Classification == ''Caerorhachis'' has usually been placed as a basal anthracosaur or a close relative of anthracosaurs. In this classification, ''Caerorhachis'' is a close ancestor of amniotes, or tetrapods that lay eggs on land. ''Caerorhachis'' has also been classified as the sister taxon of temnospondyls, a large group of extinct amphibians, based on the presence of several primitive traits. In fact, when it was named in 1977, ''Caerorhachis'' was thought to be a dendrerpetontid temnospondyl. The vertebrae of ''Caerorhachis'' are more similar to anthracosaurs, however. As in all early tetrapods, the centrum, or central part of the vertebra, is composed of two parts: the intercentrum and the pleurocentrum. While temnospondyls have large intercenta and small pleurocentra, ''Caerorhachis'' and anthracosaurs have larger pleurocentra than intercentra. A 2003 phylogenetic analysis of early tetrapods placed ''Caerorhachis'' outside the clade that included temnospondyls and anthracosaurs in an ancestral position to both groups. 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「Caerorhachis」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.