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''Urasterella'' is an extinct genus of Sea star that lived from the Ordovician to the Devonian.〔 Its fossils are known from Europe, North America and southern Africa.〔 ==Species== There have been a number of species assigned or transferred to the genus since its description in 1851.〔http://paleodb.org/cgi-bin/bridge.pl?action=checkTaxonInfo&taxon_no=31404&is_real_user=1 The Paleobiology Database ''Urasterella'' entry〕 *''U. asperrimus'' *''U. asperula'' (syn. ''Protasteracanthion primus'') *''U. biradialis'' (syn. ''Salteraster biradialis'') *''U. constellata'' *''U. coronella'' (syn. ''Salteraster coronella'') *''U. creswelli'' *''U. grandis'' *''U. gutterfordensis'' *''U. huxleyi'' *''U. imbricatus'' (syn. ''Salteraster imbricatus'') *''U. montana'' *''U. pulchella'' *''U. ruthveni'' *''U. selwyni'' (syn. ''Salteraster selwyni'') *''U. thraivensis'' *''U. ulrichi'' 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「Urasterella」の詳細全文を読む スポンサード リンク
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