Question: Which body cavity pattern is necessary to be further classified as protostome or deuterostome? Edit
Answer: In protostomes the oral end of the animals develop from first developmental opening, the blastopore. In deuterostomes , the oral end of the animals develop from a second opening on dorsal surface of the animal; the blastopore turns into the anus.
Protostomes are schizocoelomates which mean a solid mass of the embryonic mesoderm which then split to form coelom. . But the deuterostomes are enterocoelous, meaning that the coelom is formed from longitudinal pouches of the archenteron. It turns into separate cavities.
So on the basis of the pattern of coelom, these groups can be further classified. Edit
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