Assertion: soft shell clam's shell | /r/CapableOf | evolve among animal
Facets:
value: independently
type: MANNER
value: several times
type: TEMPORAL
Source sentences:
text: Paired shells have evolved independently several times among animals that are not bivalves; other animals with paired valves include certain gastropods (small sea snails in the family Juliidae), members of the phylum Brachiopoda  and the minute crustaceans known as ostracods and conchostrachans.