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Squids are invertebrates (do not have a backbone) and are in fact molluscs, so they are related to slugs and snails! There are several group s within the phylum Mollusca. The main ones are: * Bivalves (clams, oysters, scallops, mussels) which have a shell made of two halves * Gastropods (sea snails with [abalone, limpet, conch] or without [seahares, sea slugs] shells; land snails and slugs; freshwater snails) * Cephalopods (squid, octopus, nautilus, cuttlefish) The cephalopods are the most advanced molluscs and are the most intelligent invertebrates. They are characterised by the possesion of arms or tentacles. For more information see: http://en.wikipedia.org/wiki/Cephalopod http://en.wikipedia.org/wiki/Mollusk http://www.manandmollusc.net/

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17y ago

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