Shape of veliger larvae of mussel:

Correct option is B

Correct Answer: (b) D
Explanation:
→ The veliger larval stage of bivalves (including mussels) is typically D-shaped (the bivalve veliger), reflecting the developing shell margins.
→ This morphology is diagnostic in larval identification.
Information Booster:
→ After the veliger stage, larvae develop into pediveligers and then settle as spat.
Additional Information (Other Options):
(a),(c),(d): Not representative shapes for bivalve veligers.