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Paraceraurus : ウィキペディア英語版 | Paraceraurus
''Paraceraurus'' is a genus of trilobites that lived in the Ordovician period (485.4 to 443.4 Ma). Its remains have been found in China, Estonia, Sweden and North America. 〔(''Paraceraurus'' in the Paleobiology Database )〕 These trilobites have a rounded and moderately convex '' cephalon''. '' Glabella'' is convex or flattened, with a sub-rectangular outline. Thorax shows eleven segments. 〔 (Fossilstock )〕 ==Selected species==
* ''Paraceraurus exsul'' * ''Paraceraurus aculeatus'' * ''Paraceraurus ingricus'' * ''Paraceraurus gladiator'' 〔
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「Paraceraurus」の詳細全文を読む
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