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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 .
Sea tulips are tunicates with colourful bodies supported on slender stalks. [16] Sea squirts are so named because of their habit of contracting their bodies sharply and squirting out water when disturbed. [17] Sea liver and sea pork get their names from the resemblance of their dead colonies to pieces of meat. [18]
Ciona intestinalis (sometimes known by the common name of vase tunicate) is an ascidian (sea squirt), a tunicate with very soft tunic. Its Latin name literally means "pillar of intestines", referring to the fact that its body is a soft, translucent column-like structure, resembling a mass of intestines sprouting from a rock. [1]
Clavelina picta have variable cool colours. The rims of the siphons are reddish to dark purple. Their bodies are translucent. [2]Clavelina picta are invertebrate filter feeders that feed by inducing a current into the branchial cavity from the incurrent siphon, with the help of the endostyle using cilia. [3]
Tunicates feed by drawing water in through the branchial siphon at the top, filtering out phytoplankton, bacteria and other food particles, before expelling the water through the atrial siphon at the side. hydroids and algae may grow on the outside of the tunicate [2] and nudibranchs such as Nembrotha lineolata sometimes feed on them. [4]
Tunicata, also known as sea squirts or sea pork, are filter feeders attached to rocks or similarly suitable surfaces on the ocean floor; Some flatworms of the classes Turbellaria and Monogenea; Xenoturbella, a genus of bilaterian animals that contains only two marine worm-like species;
Ecteinascidia turbinata is a colonial sea squirt. The individual zooids can grow to a height of 2.5 cm (1 in) and are shaped like wide-necked bottles. They are connected by a stolon at the base through which blood circulates between the zooids and which serves to attach the colony to the substrate.
Ciona is a genus of sea squirts in the family Cionidae.. The body of Ciona is bag-like and covered by a tunic, which is a secretion of the epidermal cells. The body is attached at a permanent base located at the posterior part, and the opposite bears two openings, the buccal and atrial siphons.