Ascidiacea (commonly known as the ascidians or sea squirts) is a class in the Tunicata subphylum of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer `tunic` made of the polysaccharide tunicin, as compared to other tunicates which are less rigid. Ascidians are found all over the world, usually in shallow w.....
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Class of simple or compound tunicates that have a motile larva but sedentary adult form that filter-feeds. Sea squirts are the commonly known examples.
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