Goodbody, Ivan Department of Zoology, University of the West Indies, Kingston, Jamaica.
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A subphylum of marine animals within the phylum Chordata. Members of the Tunicata (also referred to as Urochordata) are characterized by a perforated pharynx or branchial sac used for food collection, a dorsal notochord restricted to the tail of the larva (and the adult in one class), absence of mesodermal segmentation or a recognizable coelom, and secretion of an outer covering (the test or tunic) that contains large amounts of polysaccharides related to cellulose (see illustration). See also: Chordata
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