protostome
noun Etymology: New Latin Protostomia, from prot- + Greek stoma mouth — more at stomach Date: 1959 any of a major group (Protostomia) of bilateral metazoan animals (as mollusks, annelids, and arthropods) characterized in typical forms by determinate and spiral cleavage, formation of a mouth and anus directly from the blastopore, and formation of the coelom by splitting of the embryonic mesoderm — compare deuterostome

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Protostome — Taxobox name = Protostomes fossil range = Ediacaran Recent image width = 200px image caption = Caribbean Reef Squid, an example of Protostome regnum = Animalia subregnum = Eumetazoa unranked phylum = Bilateria unranked classis = Protostomia… …   Wikipedia

  • protostome — Invertebrate phylum in which the mouth forms from the embryonic blastopore. Major protostome phyla are Annelida, Mollusca and Arthropoda. See deuterostome …   Dictionary of molecular biology

  • Protostome — Protostomia Protostomiens …   Wikipédia en Français

  • protostome — См. protostom …   Dictionary of invertebrate zoology

  • protostome — /proh teuh stohm /, n. Zool. any member of the lower invertebrate phyla in which the mouth appears before the anus during development, cleavage is spiral and determinate, and the coelom forms as a splitting of the mesoderm. Cf. deuterostome.… …   Universalium

  • protostome — noun Any animal, of the former taxon Protostomia, in which the mouth is derived from the embryonic blastopore …   Wiktionary

  • protostome — SYN: blastopore. [proto + G. stoma, mouth] * * * pro·to·stome (proґto stōm) [proto + Gr. stoma mouth] an individual of the Protostomia …   Medical dictionary

  • protostome — [ prəʊtə(ʊ)stəʊm] noun Zoology an organism whose mouth develops from a primary embryonic opening, such as an annelid, mollusc, or arthropod. Compare with deuterostome. Origin 1950s: from proto + Gk stoma mouth …   English new terms dictionary

  • protostome — pro·to·stome …   English syllables

  • protostome — pro•to•stome [[t]ˈproʊ təˌstoʊm[/t]] n. zool. any invertebrate in which the mouth appears before the anus during development, cleavage is spiral and determinate, and the coelom forms as a splitting of the mesoderm …   From formal English to slang

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