| Among the Anaspidea, numerous species of the genus Aplysia, such as A. brasiliana, are capable of swimming by undulating their parapodia. |
| Both the foot and the parapodia are innervated by nerve trunks originating most often from the pedal ganglia. |
| Swimming results from alternate dorsal and ventral flexions of two symmetrical wing-like parapodia. |
| In the Anaspidea there is a tendency for parapodia to enlarge and, together with the mantle, to enclose the fragile shell. |
| The Polychaeta lack a clitellum and have parapodia, paddle-like appendages with numerous bristles or chaetae. |
| It is a marine gastropod that swims by rhythmically flapping its wing-like parapodia. |
