Meaning Of The Word Protostome

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Protostome Meaning

Protostome Definition
Protostome Definition

What's The Definition Of Protostome?

protostome in British English
noun: a mollusc, annelid, arthropod or other animal in which the mouth develops before the anus at embryonic stage
noun: 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

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