Dibranchia
plural nounDefinition of Dibranchia
: a subclass or order of Cephalopoda including the squids and octopuses, being characterized by 2 gills, 2 auricles, 2 nephridia, an apparatus for emitting an inky fluid, and either 8 or 10 cephalic arms bearing suckers or hooks, and comprising all living cephalopods except those of the genus Nautilus
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