SSC MTS EXAM

Detailed explanation-1: -Parapodia is the locomotory structure of Nereis. They possess longitudinal and circular muscles that help in locomotion. Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming.

Detailed explanation-2: -Parapodia are the locomotory organ of segmented marine worms belonging to the class Polychaeta of phylum Annelida. For example, Nereis virens. Parapodia are dorsoventrally flattened flap-like hollow structures found on the lateral side of the trunk segments and filled with coelom.

Detailed explanation-3: -The parapodia, fleshy outgrowths on each segment following the peristome, contain bundles of setae (movable bristles), which differ in structure and function among species and thus provide a key to species identification.