| The pteropod, Cfione limacina differs from the nudibranchs and notaspids discussed so far in that it swims continuously using paired parapodial appendages that resemble wings. |
| In addition to its operation in some insects, it has been suggested that the flapping mechanism in the pteropod, Clione limacina, uses a clap-and-fling mechanism. |
| The pteropod Limacina helicina thus has an important part to play in the food chain and functioning of the Arctic marine ecosystem. |
| In almost all Gasteropod and pteropod larv there is present a well-developed spindle muscle attaching the embryo to the shell. |
| Initially, Walcott considered Matthevia to be a snail, either a pteropod or a new form of equivalent rank, although he made this assignment with reservation. |
| The pteropod mollusk Clione limacina swims by flapping a pair of wing-like parapodia. |
