Thetys vagina

Japanese: オオサルパ(英語表記)Thetys vagina
Thetys vagina
Phylum Protochordata, Subphylum Urichorta, Order Salpes, Family Salpacidae. The body is slipper-shaped and covered with a membrane, the front end being slightly wider than the rear, and the rear end has a pair of dark green tail-like projections. The body length is 12-15 cm, but larger ones can reach 20 cm. The tunic is thick and hard, and short spine-like projections are scattered on the dorsal surface. There are also 18-22 body muscles running parallel to each other in a circular pattern on the dorsal surface, which allow the fish to swim through the water by contracting them. It is found in warm waters around the world, and is food for fish.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
原索動物門尾索亜門サルパ綱断筋目サルパ科。体はスリッパ状で被膜におおわれており,前端は後部よりやや幅広く,後端には1対の暗緑色の尾状突起がある。体長は 12~15cmであるが,大きなものでは 20cmになる。被嚢は厚くて硬く,背面に短いとげ状の突起が散在する。背面にはまた 18~22個の体筋が環状に,互いに平行に走っており,これを収縮することによって水中を遊泳している。世界の温水域に分布し,魚類の餌となっている。

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