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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 ]
Oral cancer, also known as oral cavity cancer, tongue cancer or mouth cancer, is a cancer of the lining of the lips, mouth, or upper throat. [6] In the mouth, it most commonly starts as a painless red or white patch , that thickens, gets ulcerated and continues to grow.
Cases have risen dramatically over last decade, according to recent research
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 ]
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The back side of the pharynx is lined with a series of tongue-shaped dorsal languets that help transport food. An endostyle, another organ assisting in filter-feeding, is present on the front side below the oral siphon. [9] [10] The esophagus connects the pharynx to the stomach in the middle of the abdomen, followed by a tube-like intestinal ...
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.
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