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Ascidiacea (class) (Tunicata (subphylum), Chordata (phylum), ... Living Organisms (hierarchy name)) |
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Note: Class of sac-like marine filter feeders characterized by a tough outer "tunic" made of the polysaccharide tunicin, as compared to other tunicates which are much less robust. They have with some primitive vertebrate features, found in all seas from the intertidal zone to the greatest depths. The tadpole-like larvae are free-swimming and have a notochord (a flexible, rod-like structure common to all vertebrates) and a nerve cord in the tail. When the larva finds a place to settle, it attaches itself with a sucker; the tail with its notochord and nerve cord is absorbed and disappears. They are commonly found on pier pilings, ships' hulls, rocks, large seashells, and the backs of large crabs. Some species live individually; others live in groups or colonies. Adults have functional male and female reproductive organs; fertilization occurs when eggs are shed into the water and come into contact with sperm from another individual.
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| Terms: |
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| Ascidiacea (class) (preferred,C,U,S,English-P,D,U,N)
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| Ascidiacea (class) (Latin-P,D,U,N)
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| sea squirts (C,U,LC,C,English,AD,U,N)
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| sea squirt (C,U,English,AD,U,N)
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| sea-squirts (C,U,English,UF,U,N)
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| Ascidiae (C,U,English,UF,U,N)
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| ascidians (C,U,English,UF,U,N)
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| squirts, sea (C,U,English,UF,U,N)
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| 海鞘綱 (綱) (C,U,Chinese (traditional)-P,D,U,U)
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| 海鞘 (C,U,Chinese (traditional),UF,U,U)
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| hǎi qiào gāng (C,U,Chinese (transliterated Hanyu Pinyin)-P,UF,U,U)
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| hai qiao gang (C,U,Chinese (transliterated Pinyin without tones)-P,UF,U,U)
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| hai ch'iao kang (C,U,Chinese (transliterated Wade-Giles)-P,UF,U,U)
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Facet/Hierarchy Code: H.HL |
Hierarchical Position:
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Agents Facet |
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.... Living Organisms (hierarchy name) (G) |
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........ living organisms (entities) (G) |
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............ Eukaryota (domain) (G) |
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................ Animalia (kingdom) (G) |
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.................... Chordata (phylum) (G) |
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........................ Tunicata (subphylum) (G) |
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............................ Ascidiacea (class) (G) |
Additional Notes: |
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| Chinese (traditional) ..... 囊狀海生濾食動物綱；特徵為體外具強韌的被囊，由多醣類被囊素構成。相較於其他尾索動物，海鞘綱動物較不強健。海鞘類動物具原始脊椎動物的特徵，從潮間帶到最深處的所有海域，皆可見其蹤跡。狀似蝌蚪的幼體營自由游泳生活，尾部具一脊索(為一可彎曲似竿的結構；所有脊椎動物皆有)，及一神經索。幼體找到棲息地時，會利用吸器吸附於上，具脊索與神經索的尾部則被吸收而消失。常見於碼頭的樁材、船身、岩石、大海貝以及大螃蟹背上。部份海鞘單獨生活，其他則是過著群體生活。成體擁有具實際機能的雄性與雌性生殖器官；雌體排出的卵，在水中與另一雄體的精子接觸時，即產生受精作用。 |
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