Glochidium larva is found in (1) Pola (2) Unio (3) Sepia (4) Asterias

Answer: (2)

The glochidium or plural glochidia is a microscopic larval stage of some freshwater mussels, aquatic bivalve molluscs in the families Margaritiferidae, and Unionidae.

This larva form has hooks that allow it to bind to fish for a time until it detaches and falls to the substrate and assumes the typical form of a juvenile mussel. Owing to the fact that a fish is active and free-swimming, this cycle helps to disperse the species of mussels to new habitat areas that it could not enter otherwise.

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