A general term for crustaceans in the family Sacculinidae of the order Rootcephaly of the subclass Cirripedia. They are pouch-shaped and attach and parasitize mainly the abdomens of decapods such as crabs. The body of a pouch is attached to the abdomen of a crab or other animal by a short stalk and is covered only with a thin mantle membrane, without any shell plates like those of barnacles or oysters. There are internal organs inside the pouch-like body, but no appendages or digestive organs, and it is filled with ovaries and testes. The nauplii larvae that hatch from the eggs swim out into the sea through a small hole in one part of the pouch. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
蔓脚(まんきやく)亜綱根頭目フクロムシ科Sacculinidaeの甲殻類の総称。袋状で,おもにカニなど,十脚類の腹部に着生,寄生する。カニなどの腹部に短い柄でついているフクロムシの体は,薄い外套(がいとう)膜で覆われているだけで,フジツボやエボシガイなどのような殻板はまったくない。袋状をした体の中には内臓があるが,付属肢や消化器官などはまったくなく,卵巣や精巣で満たされている。 卵から孵化(ふか)したノープリウス幼生は袋の一部に開いている小孔から海中に泳ぎ出る。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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