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''Paracentrotus lividus'' is a species of sea urchin in the family Parechinidae commonly known as the purple sea urchin. It is the type species of the genus and occurs in the Mediterranean Sea and eastern Atlantic Ocean.〔 ==Description== ''P. lividus'' has a circular, flattened greenish test with a diameter of up to seven centimetres. The test is densely clothed in long and sharply pointed spines that are usually purple but are occasionally other colours including dark brown, light brown and olive green. There are five or six pairs of pores on each ambulacral plate. The tube feet are in groups of 5 or 6, arranged in small arcs.〔(Purple sea urchin - ''Paracentrotus lividus'' ) Marine Life Information Network. Retrieved 2011-08-23.〕 Paracentrotus lividus, aboral view.JPG|Aboral side. Paracentrotus lividus, oral view.JPG|Oral side (underside, with the mouth at the center). Paracentrotus lividus spines.JPG|Close-up on the spines, showing a lighter circle at the root. EchinoideaSeeigel02.JPG|Brown young. Paracentrotus lividus MHNT France.jpg| Test 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「Paracentrotus lividus」の詳細全文を読む スポンサード リンク
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