Assertion: gastropod | /r/AtLocation | single shells
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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.