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protostomeOne entry found for protostome. Main Entry: pro·to·stome Pronunciation: 'prO-t&-"stOm Function: noun Etymology: New Latin Protostomia, from prot- + Greek stoma mouth -- more at STOMACH : 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
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