Assertion: gastropod | /r/HasProperty | single shells
Facets:
Source sentences:
text: In fact people with no specialist knowledge are more likely to think of them as comprising separate groups: the gastropods (single shells), such as abalone or whelk, inhabiting single shells; the bivalves, such as clams and oysters, which have double shells; and the cephalopods (the name literally means "head-feet," referring to their strange configuration), which include cuttlefish, squid, and octopus.