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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 Chasmataspidida ： ウィキペディア英語版 Chasmataspidida Chasmataspidida (often referred to informally as ''chasmataspids'') are a rare, extinct group of chelicerate arthropods. They are probably related to horseshoe crabs (Xiphosura) and/or sea scorpions (Eurypterida). Indeed the first species to be discovered were thought to be unusual fossil horseshoe crabs, while later species were often based on specimens initially misidentified as eurypterids. There is some evidence that chasmataspids were present during the late Cambrian and the group is known sporadically in the fossil record through to the mid Devonian. Chasmataspids are most easily recognised by having an abdomen divided into a short forepart (or mesosoma) and a longer hindpart (or metastoma) comprising nine segments. There is some debate about whether they form a natural (i.e. monophyletic) group. ==The chasmataspid genera== 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「Chasmataspidida」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.