Ootaru mawashi - Ootaru mawashi

Japanese: オオタルマワシ - おおたるまわし

...It is widely distributed in the seas near Japan, and is also found in inland bays influenced by ocean waters. A similar species, the large-tailed sea eagle Phronima sedentaria (illustration), belongs to the Phronidae family, and invades and parasitizes the bladder of planktonic protochordates, the sea urchins of salps, and the cloaca of ascidians, feeding on parts of the host's body and making it into its own home, where it raises its larvae. It is distributed in the Pacific Ocean south of central Japan. ...

From Tarumawashi

...The stomach always contains diatom shells, planktonic algae cells, and fragments of copepods, and it seems that they feed on such things. The largest of this species is the large-tailed sea eagle, Phronima sedentaria (illustration), which is 6-35 mm long. Females are known to have the strange habit of entering the gelatinous burrows of planktonic protochordata such as salps, sea urchins, and ascidians, eating the surrounding tissue, and building a barrel-shaped dwelling in which they live and raise their larvae. The closely related Phronima stebbingi, P. stebbingi , is small, with a body length of 3-9 mm, and is somewhat more widely distributed, even in cold waters.

*Some of the terminology that refers to the "Great Tarantula" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…日本近海に広く分布し，外洋水の影響がある内湾にも見られる。近似種のオオタルマワシPhronima sedentaria（イラスト）はタルマワシ科に属し，浮遊性原索動物のウミタル，サルパの被囊内，ヒカリボヤの総排出腔内に侵入，寄生し，宿主の体の一部を食害し，みずからの住居に仕立て，その中で幼生を育てる習性がある。日本の中部以南の太平洋に分布。…

【タルマワシ(樽廻)】より

…胃からはケイ藻の殻など，浮遊性藻類の細胞や，橈脚（じようきやく）類などの体の破片などがつねに見られ，このようなものを食物としているらしい。この類の最大はオオタルマワシPhronima sedentaria（イラスト）で体長6～35mm，雌は浮遊性の原索動物のサルパ，ウミタルやヒカリボヤなどのゼラチン質の被囊内に入り込み，周囲の組織を食べて，樽状の住居にしたて，その中にすみ，幼生を保育する奇習があることが知られている。近似のフロニマ･ステビンギP.stebbingiは体長3～9mmと小型で，分布はやや広く，冷水域にも見られる。…

※「オオタルマワシ」について言及している用語解説の一部を掲載しています。

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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