An octopus of the family Malvaceae in the class Cephalopoda. The term "octopus shell" actually refers to the shell, and the soft body is called a "funedako." Its English name is paper nautilus, but it is completely different from a nautilus (a type of nautilus). It is smaller than a nautilus. Its body length is about 12 cm, and its mantle is round but slightly pointed. Females secrete calcium carbonate from their specialized, membranous first arm to create a shell for breeding. They can enter and exit the shell freely, and lay their eggs inside. There is no partition inside the shell like in nautiluses. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
頭足綱アオイガイ科のタコ。タコブネは本来殻のほうを指し,軟体はフネダコと呼ばれる。英名はpaper nautilusといわれるがnautilus(オウムガイ類)とはまったく異なる。アオイガイに比べると小さい。体長は12cmくらいで,外套(がいとう)はまるいがややとがっている。雌は膜状に特殊化した第1腕から炭酸カルシウムを分泌し,保育用の殻をつくる。殻には自由に出入りでき,その中で産卵する。殻内はオウムガイ類のような隔壁はない。
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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