True enterocoelic coelom appeared first in the course of evolution in:

Echinodermata

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Annelida

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Chordata

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Protozoa

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Solution

The correct option is A Echinodermata
Enterocoelomates is an animal in which the mesoderm-lined body cavity coelom arises in the embryonic stage as an out pocketing of the developing gut (enteron). This form of development, found in echinoderms and a few other invertebrate phyla and in chordates. It appeared first in Echinodermata during the course of evolution.
So, the correct option is A.

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