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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
Polycarpa aurata grows to a height of 5 to 15 cm (2 to 6 in). It has an urn-shaped, hollow body with two siphons, one at the top and the other on the side. The body colour of this tunicate is white with purple and orange patches and purple lines.
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 ]
Polyandrocarpa have been found in marine environments globally. [14] Species can range from shallow environments to benthic environments. For example, Polyandrocarpa zorritensis is a shallow species, whereas Polyandrocarpa arianae have been found deeper than 90 meters in the Mediterranean Sea.
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.
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Sycozoa pulchra, (common name - stalked ascidian) [2] is a sea squirt in the family Holozoidae, first described by William Abbott Herdman in 1886 as Colella pulchra. [1] [3] The taxonomic decision which determined the name, Sycozoa pulchra, and the species' synonymy was given by Patricia Kott in 1990.