A) Amphioxus
B) Herdmania
C) Nereis
D) none of these.
Correct Answer: B
Solution :
: Retrogressive metamorphosis in Herdmania takes place in the tadpole larva, which shows following changes- tail begins to reduce and finally disappears, four ectodermal ampullae arise from trunk, region between adhesive papillae and mouth undergoes exceptional growth etc. These changes brings about reorientation of the body parts and the larva attains adult condition.
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