A) trochophore
B) tornare
C) dipleurala
D) bipinnaria
Correct Answer: C
Solution :
On the basis of anatomical, embryological and paleontological evidences, some workers have tried to establish that chordates have directly originated from an echinoderm larva. The dipleurala is regarded as a common ancestral form of echinoderms, hemichordates and chordates.
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