Fire Eyes - Hardwood

Japanese: 火体目 - かたいもく
Fire Eyes - Hardwood

… Protochordata are divided into two classes, Urochordata and Cephalochordata, according to the condition of the notochord. Urochordata includes four orders: Ascidiacea, Thaliacea, Appendicularia, and Pyrosomata. The squirts, salps, sea squirts, larvae, and cyanophora in each order are very different in appearance, but Ascidiacea, Salpa, and Cynophora have tails with notochords only in the larval stage, while Cercophora have tails with notochords even in the adult stage. …

From [Tunicate]

…a class of protochordata. All of them live in the sea and include four orders: Appendicularia, Thaliacea, Pyrosomata, and Ascidiacea. When young, urochordates are tadpole-shaped and have a notochord in their tails, but when they metamorphose and begin to live epiphytically, the notochord and the muscles of the tail are absorbed into the head and are no longer visible.

*Some of the terminology explanations that mention "Hi-tai-me" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 原索動物は脊索の状態によって尾索類Urochordataと頭索類Cephalochordataの2綱に分けられる。尾索類にはホヤ目Ascidiacea,サルパ目(タリア目)Thaliacea,尾虫目(オタマボヤ目)Appendicularia,火体目(ヒカリボヤ目)Pyrosomataの4目が含まれる。各目に含まれるホヤ,サルパ,ウミタル,オタマボヤ,ヒカリボヤなどはそれぞれ形態が非常に違っているが,ホヤ目とサルパ目,火体目には幼生の時期のみ,そして尾虫目は成体でも脊索が通っている尾をもっている。…

【尾索類】より

…原索動物門の1綱。すべて海産で,尾虫目Appendicularia,サルパ目Thaliacea,火体目Pyrosomata,ホヤ目Ascidiaceaの4目を含む。尾索類の幼時は,オタマジャクシ形をしていて,尾の部分に脊索が見られるが,変態して着生生活にはいると,脊索と尾の筋肉がいっしょに頭の部分に吸収されてまったく見られなくなる。…

※「火体目」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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