Kairoudoketsukaimen (English spelling) Venus' flower basket

Japanese: カイロウドウケツカイメン(偕老同穴海綿) - カイロウドウケツカイメン（英語表記）Venus’ flower basket

A general term for marine sponges of the Euplectellidae family of the class Hexactinellidae. A pair of small shrimp ( Spongicola ), usually male and female, are usually housed in the stomach cavity of this sponge, and since this is where they live their whole lives, the name Kairo Do-ken ("living together in the same cave") was given to them, meaning that they grow old together when they live, and are buried together when they die. They are found in Sagami Bay, Suruga Bay, Tosa Bay, etc., and stand upright by sticking a bundle of root hair-like bone fragments into the seabed at depths of 100 to 1,000 meters.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

六放海綿綱カイロウドウケツ科Euplectellidaeの海綿動物の総称。このカイメンの胃腔の中に，通常雌雄1対の小さなエビ(ドウケツエビSpongicola)が入っていて，この場所を生涯のすみかにしているところから，このエビは生きてはともに老い，死んではいっしょに葬られる意味の偕老同穴の名がつけられた。相模湾，駿河湾，土佐湾などに分布し，水深100～1000mの海底に根毛状の骨片の束をつきさして直立している。

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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