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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 .
Ascidiidae ("same-sac family") is a family of tunicates in the class Ascidiacea. [1] [2] Some species contain elevated amounts of vanadium. There are 4 genera: Ascidia; Ascidiella; Fimbrora; Phallusia; Psammascidia
Botryllus schlosseri (class Ascidiacea) is a colonial tunicate, a member of the only group of chordates that are able to reproduce both sexually and asexually. B. schlosseri is a sequential (protogynous) hermaphrodite, and in a colony, eggs are ovulated about two days before the peak of sperm emission. [60]
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 lamina; the dotted line indicates the endostyle.
Phlebobranchia is an order of sea squirts in the class Ascidiacea, [1] first described by Fernando Lahille in 1886. [2] Characteristics.
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Stolidobranchia is an order of tunicates in the class Ascidiacea. [1] The group includes both colonial and solitary animals. They are distinguished from other tunicates by the presence of folded pharyngeal baskets. This provides the etymology of their name: in ancient Greek, στολίς, ίδος means the "fold" of a cloth.
Aplousobranchia is an order of sea squirts in the class Ascidiacea, first described by Fernando Lahille in 1886. [1] [2] They are colonial animals, and are distinguished from other sea squirts by the presence of relatively simple pharyngeal baskets.