Definition for Protostome
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Revision as of 21:01, 28 January 2011 by Bio man (Talk | contribs) (Created page with "An animal that exhibits spiral determinate cleavage and in which the blastopore becomes the mouth; includes molluscs, annelid worms, and arthropods.")
An animal that exhibits spiral determinate cleavage and in which the blastopore becomes the mouth; includes molluscs, annelid worms, and arthropods.