Cestodaria

A subclass of the class Cestoidea, containing tapeworms that lack a scolex and are unsegmented (monozoic), in contrast to the typical tapeworms in the subclass Cestoda; larvae of c. (called lycophora) characteristically have 10 hooklets rather than six. C. are believed to be primitive tapeworms, parasitizing the intestine and celomic cavities of certain fish and a few reptiles.

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Ces·to·dar·ia .ses-tə-'dar-ē-ə n a subclass of the class Cestoda comprising unsegmented intestinal parasites of sharks, rays, and primitive bony fish

ces·to·dar·ian -ē-ən n

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Ces·to·da·ria (ses″to-darґe-ə) a subclass of tapeworms, the unsegmented tapeworms of the class Cestoidea, which are endoparasitic in the intestines and coelom of various primitive fishes and rarely in reptiles.