Question

Differentiate between Protostomia and Deuterostomia

Answer 1

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Answer 2

Majority of coelomate invertebrates develop as protostomes meaning first mouth so in the protostomes the oral end of the animal develops from the first developmental opening, the blastopore. They include most of the invertebrate animal phyla.  In the deuterostomes meaning second mouth so in them the oral end of the animal develops from the second opening on the dorsal surface of the animal; the blastopore becomes the anus. They include echinoderms and ancestors of chordates.