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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 Eolydekkerina ： ウィキペディア英語版 Eolydekkerina ''Eolydekkerina'' is an extinct genus of temnospondyl amphibian from the Early Triassic of South Africa. It belongs to the family Lydekkerinidae, along with the closely related genus ''Lydekkerina''. It is known from a single type species, ''Eolydekkerina magna'', which was named in 1996 from a part of the Beaufort Group called the ''Lystrosaurus'' Assemblage Zone. ==Description== ''Eolydekkerina'' is known from two specimens: a skull lacking the lower jaws and a poorly lower jaw, not associated with the skull. At in length, the skull of ''Eolydekkerina'' is larger than that of any ''Lydekkerina'' specimen. The snout is proportionally much longer, and the eye sockets are placed farther apart than they are in ''Lydekkerina''. The proportions of the skull in ''Eolydekkerina'' are similar to those of the Australian lydekkerinid genus ''Chomatobatrachus''. However, ''Eolydekkerina'' shares more features in common with ''Lydekkerina'', including the nearly identical shape of bones at the back of the skull. The skull is roughly triangular in shape when viewed from above, with straight side margins. The margins of the eye socket are raised and the middle of the snout is slightly indented. Shallow grooves run along the surface of the skull behind the eye sockets and below the nostril openings.〔 The lengthened skull of ''Eolydekkerina'', while different from that of ''Lydekkerina'', is similar to those of the related rhinesuchids and capitosaurians. The short skull of ''Lydekkerina'' is thought to be a derived or advanced characteristic, suggesting that ''Lydekkerina'' evolved from a more typical longer-skulled temnospondyl. Since temnospondyl skulls tend to lengthen as individuals of a species age, the skull of ''Lydekkerina'' may represent a juvenile form, while the skull of ''Eolydekkerina'' represents a fully-grown adult form. If ''Lydekkerina'' is the descendant of ''Eolydekkerina'', it likely evolved by retaining juvenile characteristics into adulthood in a condition known as paedomorphosis.〔 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「Eolydekkerina」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.