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Poromya granulata : ウィキペディア英語版
Poromya granulata

''Poromya granulata'', or the granular poromya, is a species of marine bivalve mollusc in the family Poromyidae. It is unusual among bivalves in being carnivorous. It is found in more northerly parts of the Atlantic Ocean.
==Description==
''Poromya granulata'' is a dull-white coloured shell with dome-shaped valves and grows to about long. The valves are thin and fragile, subequivalve and subequilateral. They are roughly oval in shape with a rounded anterior margin and a subtruncated, sloping posterior margin. The umbones are prominent. The surfaces of the valves have faint concentric sculpture lines and are covered in rows of fine granulations. The margins are smooth and the ligament is mostly internal. The right valve has a single cardinal tooth and the left valve has a ridge-like lateral tooth and a socket for the cardinal from the right valve. The inside of the valves is nacreous and the pallial line has a broad, shallow sinus.〔(''Poromya granulata'' (Nyst & Westendorp, 1839) ) Marine bivalve shells of the British Isles. Retrieved 2012-01-13.〕

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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