- ə) the major division of the higher invertebrates, including mollusks, annelids, arthropods, echinoderms, and chordates, which all have a separate mouth and anus, a true coelom, and a well-developed circulatory system. It is divided into two series, the Deuterostomia and the Protostomia.
Medical dictionary. 2011.
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coelom — SYN: body cavity. * * * coe·lom sē ləm n, pl coeloms or coe·lo·ma·ta si lō mət ə the usu. epithelium lined body cavity of metazoans above the lower worms that forms a large space when well developed between the digestive tract and the body wall… … Medical dictionary
Deuterostomia — Deu·tero·sto·mia (doo″tər o stoґme ə) [deutero + Gr. stoma mouth + ia] a series of the Eucoelomata, including the echinoderms, hemichordates, and chordates, in all of which the site of the blastopore is posteriorâ€”far from the… … Medical dictionary
eucoelomate — eu·coe·lo·mate (u seґlə māt″) any member of the Eucoelomata; called also coelomate … Medical dictionary
Protostomia — Pro·to·sto·mia (pro″to stoґme ə) a series of the Eucoelomata, including the mollusks, annelids, and arthropods, in all of which the mouth arises from the blastopore … Medical dictionary