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Pentecopterus
''Pentecopterus'' is an extinct genus of sea scorpion that lived during the Ordovician period, as early as 467.3 million years ago.〔 One species is ''P. decorahensis''. It is the oldest described eurypterid, and, at an estimated length of up to ,〔 one of the largest known arthropods ever discovered, similar in size to the famous millipede-like ''Arthropleura''. Other notable sea scorpions include the more recent Silurian-aged ''Acutiramus'', and Devonian ''Jaekelopterus'', the only arthropod currently known to surpass ''P. decorahensis'' in size. According to researcher James Lamsdell, of Yale University, ''P. decorahensis'' "is the first real big predator".〔
==Description==
The generic name refers to the "penteconter", an ancient Greek warship, due to similarities in shape and predatory behavior.〔〔〔 It is the oldest described eurypterid, living as early as 467.3 million years ago;〔 at an estimated length of ,〔 or up to ,〔〔 it is also one of the largest known arthropods.〔〔 According to researcher James Lamsdell, of Yale University, the species "is the first real big predator".〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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