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''Tylopterella'' is a genus of prehistoric eurypterid which lived from the Ordovician to the Upper Carboniferous period. It is of uncertain taxonomic placement within the order Eurypterida. ''Tylopterella'' is distinguishable by its small size, and its thick, partly calcareous exoskeleton with curved ridges of confluent tubercules and large knobs near the median line. Its prosoma (head) has a raised margin.〔Størmer, L. 1955. Merostomata. ''Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata'', P34.〕 One species may be recognised: *''Tylopterella boyli'' (Whiteaves, 1884) – Silurian, USA & Canada A second species, ''Tylopterella menneri'' (Novojilov, 1959), was described from Devonian of Talmyr, Russia; however, it was subsequently reinterpreted as a member of Chasmataspidida rather than a eurypterid, an assigned to a separate genus ''Dvulikiaspis''. ==References== 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「Tylopterella」の詳細全文を読む スポンサード リンク
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