Question

The common larva of polychaeta/annelida is

• A. Trochophore
• B. Actinotrocha
• C. Glochidium
• D. Tornaria

Answer 1

The correct option is A Trochophore

Trochophore, also called trochosphere, small, translucent, free-swimming larva characteristic of marine annelids and most groups of mollusks. Trochophores are spherical or pear-shaped and are girdled by a ring of cilia (minute hairlike structures), the prototroch, that enables them to swim. Each segment bears a pair of paddle-like and highly vascularized parapodia, which are used for movement and, in many species, act as the worm's primary respiratory surfaces. Bundles of bristles, called setae, the project from the parapodia.

So the correct answer is 'Trochophore'.