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Ascandra contorta : ウィキペディア英語版 | Ascandra contorta
''Ascandra contorta'' is a species of calcareous sponge belonging to the family Clathrinidae. This is a whitish sponge which appears as a mass of irregular, convoluted tubes. It is very similar to ''Clathrina clathrus'' but usually differs in colour (''C. clathrus'' is usually yellow) and by the presence of terminal oscula on vertical tubes (absent in ''C. clathrus''). When viewed microscopically, the spicule structure of the two species is very different, ''A. contorta'' possessing two-pointed ''diactines'' and four-pointed ''tetractines'' as well as the three-pointed ''triactines'' which ''C. clathrus'' is exclusively made up of. This sponge is found on north-east Atlantic coasts from the Arctic to the Mediterranean, usually on rocks at depths of 10–30 m, but occasionally in shallower water. ==References==
*(''Clathrina contorta'' at Marine Species Identification Portal )
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「Ascandra contorta」の詳細全文を読む
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