Octopuses, squid, cuttlefish and the chambered nautilus: exclusively marine, predatory mollusks with a ring of arms or tentacles around the head, highly developed eyes, and, in octopuses and squid especially, the most sophisticated nervous systems and problem-solving abilities known among invertebrates.
Facts
Disputed
Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Connections
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