Assertion: mollusk's foot | /r/HasProperty | extended among gastropods of the subclass
Facets:
value: to form even flapping wings
type: PURPOSE
value: laterally
type: MANNER
value: to form swimming lobes
type: PURPOSE
Source sentences:
text: Among gastropods of the subclass Opisthobranchia, the foot may be extended laterally to form swimming lobes (parapodia), or even flapping wings (in pteropods, or sea butterflies).