n. plCestoidea(Zoöl) A class of parasitic worms of the phylum Platyhelminthesformerly Platelminthes) of which the tapeworms are the most common examples. The body is flattened, and usually but not always long, and composed of numerous joints or segments, each of which may contain a complete set of male and female reproductive organs. They have neither mouth nor intestine. See Tapeworm.
Century Dictionary and Cyclopedia
cestoideaAn order of platyhelminths or flatworms, having no intestinal cavity; the tapeworms; Tæniata or Agastreæ. They are internal parasites, without digestive or blood-vascular systems, hermaphrodite, mostly of an elongated and flattened form, like a piece of tape, and with the anterior end of the body, or head, provided with hooks, suckers, spines, or other armature for adhering. In the typical forms the animal is segmented, and in the tapeworm Tænia solium there may be as many as 800 joints; but the head alone is the true animal, the joints or proglottides being merely hermaphroditic reproductive organs budded from the head. The embryo is called a proscolex, and at a later stage a scolex; in the encysted state the animals are known as hydatids. The chain of reproductive segments is the strobila. There are several families of cestoids, as the Tæniidæ, Dibothriidæ, Diphyllidæ, Tetraphyllidæ, Tetrarhynchidæ, and Caryophyllædæ. Also called Cestoda.
cestoideaA group of tentaculate Ctenophora having a compressed, bandlike body and containing the single family Cestidæ.