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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 .
Polycarpa aurata, also known as the ox heart ascidian, the gold-mouth sea squirt or the ink-spot sea squirt, is a species of tunicate in the family Styelidae. Description [ edit ]
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.
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 ]
Herdmania momus found in Makadi Bay, Hurghada, Red Sea, Egypt Herdmania momus found in Makadi Bay, Hurghada, Red Sea, Egypt. The solitary ascidian Herdmania momus is one of the most commonly encountered species of ascidians.
Clavelina ossipandae, the skeleton panda sea squirt or skeleton panda ascidian (Japanese: ガイコツパンダホヤ, romanized: gaikotsu-panda-hoya), is a species of colonial ascidian (), a group of sessile, marine filter-feeding invertebrates.
The predatory tunicate (Megalodicopia hians), also known as the ghostfish, [2] is a species of tunicate which lives anchored along deep-sea canyon walls and the seafloor.It is unique among other tunicates in that rather than being a filter feeder, it has adapted to life as an ambush predator.
Digestive tract is complete. Liver and pyloric glands are present. Respiration is with the help of branchial sac. Water enters the body from the region of mouth or branchial aperture, passes through the pharynx where food is picked up. It comes out through atrial aperture. The current is maintained by cilia lining the gill slits.