Brachiopoda

Japanese: Brachiopoda
Brachiopoda

…They are considered to be one of the fouling organisms because they attach to various organisms and facilities and cause harm. The body of the Brachiopoda is surrounded by two shells located dorsoventrally, with a muscular stalk protruding from the rear end of the shell. Inside the shell cavity is a horseshoe-shaped arm bone, which supports the crown of tentacles. …

From 【Brachiopoda】

… The basic morphology of the soft body surrounded by two shells is very similar to that of bivalves, but while bivalves have two shells that are almost equal in shape and size, the shells of brachiopods are different in shape and size. In addition, the stages from development to larvae are very different, so while bivalves belong to the mollusks, brachiopods form an independent phylum, Brachiopoda, but are sometimes classified as a class of Tentacula. This strange name comes from the fact that the feeding organs inside the shells, called the tentacles, were initially mistaken for the locomotion organs of mollusks, and the Latin words brachium and pod, meaning arm and leg, were combined to form the name Brachiopoda. …

*Some of the terminology that mentions "Brachiopoda" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…いろいろな生物や諸施設に付着して害を与えるので汚損生物の一つとされる。 腕足綱Brachiopodaは体は背腹に位置する2枚の貝殻で包まれ,殻の後端から筋肉質の柄を出している。殻腔内には馬蹄状の腕骨があり,これで触手冠を支えている。…

【腕足類】より

… 軟体部が2枚の殻によって包まれているという基本的な形態が二枚貝類とよく似ているが,二枚貝類が形も大きさもほぼ等しい2枚の殻をもっているのに対し,腕足類の殻は形も大きさも違う。加えて,発生から幼生までの段階が大きく異なるので,二枚貝類が軟体動物に属するのに対し,腕足類は腕足動物として独立した1門Brachiopodaをなしているが触手動物門の1綱とすることもある。この奇妙な名称は,当初殻の内部にある触手冠と呼ばれる集餌器官を軟体動物の移動器官とまちがえて,それぞれ腕と足を意味するラテン語brachiumとpodを結びつけてBrachiopodaとしたことに由来する。…

※「Brachiopoda」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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