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Pisidium obtusale : ウィキペディア英語版 | Pisidium obtusale
''Pisidium obtusale'' is a species of freshwater bivalve from family Sphaeriidae.
==Description== The 2.5-3.5mm. shell is very tumid (swollen). It is an angular-oval shape with broad, rounded umbos which are behind the mid point. The surface (periostracum) is glossy with fine concentric striae. Numerous pores are visible inside the shell. The colour is whitish to yellowish often coated with a red-brown deposit.
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「Pisidium obtusale」の詳細全文を読む
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