| 翻訳と辞書 |
| Drepanopterus ： ウィキペディア英語版 |
Drepanopterus
''Drepanopterus'' is an extinct genus of eurypterid. There are currently two species assigned to the genus. The genus has in the past been assigned its own family, with nine species associated with the genus ''Drepanopterus'', however five of these have since been proven to be synonyms of pre-existing species, assigned to their own genera, or found to be based on insubstantial fossil data (the holotype of one proved to be a lithic clast).
''Drepanopterus pentlandicus'' was first described from the Silurian strata of the Pentland Hills in Scotland. The only other fully described valid species is ''Drepanopterus abonensis'', from the Upper Devonian of Portishead, Somerset. The exact relationship of ''Drepanopterus'' to other Eurypterids has long been unclear, however it is now apparent that it is a primitive hibbertopteroid, and an early relative of the Carboniferous ''Hibbertopterus''.
== Description ==
''Drepanopterus'' is distinguished by its "fairly large" size, compound eyes with parallel axes on a subrectangular to subovate prosoma (head). All of its legs are walking legs; the first three pairs are short and powerful, with spines; the last two pairs are moderately long, ending in strongly curved terminal claw. The last leg reaches as far as the penultimate abdominal segment. The telson ranges from styliform to clavate. Drepanopterus date from the Silurian to the Upper Devonian periods.〔L. Størmer. 1955. Merostomata. ''Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata'', p. 36–37.〕
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「Drepanopterus」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.
|
|