Diagrammatic section of an Ascidia, representing the three sacs and the branchial sac as the pharynx or throat: (a) branchial orifice; (b) atrial orifice; (c) tunic or test (d) mantle; (e) branchial sac; (f) gullet; (g) stomach; (h) anal orifice; (i) dorsal …

Synoicum pulmonaria, the tennis ball ascidian or sea-fig, is a species of colonial sea squirt, a tunicate in the family Polyclinidae. It occurs in shallow water in the northeastern Atlantic Ocean, the North Sea and the English Channel, and also, to a …

Ascidiacea, commonly known as the ascidians or sea squirts, is a paraphyletic class in the subphylum Tunicata of sac-like marine invertebrate filter feeders. [2] Ascidians are characterized by a tough outer test or "tunic" made of the polysaccharide cellulose .

Ascidia, in adult stage, are a solitary animal having a bag-like body (Fig. 3.1 A). The surface is smooth and naked. The body is covered by a thick, slightly cartilaginous and translucent tunic or test. Because of the presence of tunic, the urochordates are called Tunicata (tunicates).

海鞘 （学名： Ascidiacea）是 脊索动物 门 被囊動物（尾索动物） 亚门 海鞘纲 的总称，生活於海水中，在全世界已發現二千八百多种海鞘 [2] 。 常见的海鞘有： 玻璃海鞘 、 有柄海鞘 、 拟菊海鞘 等。 有種海鞘又称 海中凤梨 、 海凤梨 或 海菠蘿，因其外型像 凤梨 而得称。 在 中国 山东省 沿海一带也將海鞘俗称為 海奶子。 海鞘分為獨立或者群聚生活的不同類型。 獨立生活的海鞘身体呈现壶型或囊型，其体壁即为包藏 器官 的 外套膜 （mantle），其体壁可向外分泌被 …

Ascidia is exclusively marine and occurs at all depths of the sea. It is sessile in adult stage, but the larva is a free-swimming form. The adults remain attached to the bottom of the sea or other substrata by its base. Ascidia is a microphagous animal, i.e., it feeds on microorganisms. The food materials are obtained by ciliary action. 2.

2001年9月7日 · Ascidians, or sea squirts, are invertebrate chordates that belong to the earliest branch in the chordate phylum, the subphylum Urochordata or Tunicata . Ascidian larvae possess a prototypical chordate body plan that includes a dorsal neural tube, an axial notochord flanked by muscles, and a ventral endodermal strand ( Satoh, 1994 ; Figure 1B ).

Most ascidians are hermaphrodites (produce both eggs and sperm) and reproduce by external fertilisation (releasing eggs and sperm into the water). The free-swimming larva they produce are known as ascidian tadpoles.

Synoicum pulmonaria, the tennis ball ascidian or sea-fig, is a species of colonial sea squirt, a tunicate in the family Polyclinidae. It occurs in shallow water in the northeastern Atlantic Ocean, the North Sea and the English Channel, and also, to a …

2020年1月1日 · The ascidians (class Ascidiacea) are sessile as adults and are the most speciose group of tunicates, represented by nearly 3000 separate types (WoRMS, 2019) across three orders, Phlebobranchia, Stolidobranchia and