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protostomeenUK
pro·to·stome P5670700 (prōt′tə-stōm′)n. Any of numerous invertebrate animals of the group Protostomia, in which the mouth develops from the first opening in the embryo and the anus develops later, and including the mollusks, annelids, and arthropods.
[From New Latin Prōtostomia, taxon name : proto- + New Latin stoma; see stoma.]protostome (ˈprəʊtəʊˌstəʊm) n (Zoology) a mollusc, annelid, arthropod or other animal in which the mouth develops before the anus at embryonic stagepro•to•stome (ˈproʊ təˌstoʊm)
n. 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.
EncyclopediaSeeBlastoporeprotostomeenUK
blas·to·pore (blas'tō-pōr), The opening into the archenteron formed by invagination of the blastula to form a gastrula. Synonym(s): protostoma, protostome [blasto- + G. poros, opening] protostome (prōt′tə-stōm′)n. Any of numerous invertebrate animals of the group Protostomia, in which the mouth develops from the first opening in the embryo and the anus develops later, and including the mollusks, annelids, and arthropods.ThesaurusSeeblastopore |