Octopus (Octopus): 26 genera and 252 species of marine mollusks in the family Octopidae. It is the largest family of Cephalopoda, which can be divided into deep-sea polypod subfamily (Bathypolypodinae), Ai Erduo subfamily of Octopus (Eledoninae), Valley Octopus subfamily (Graneledoninae) and Octopodidae subfamily (Octopodinae). The body is ovate or ovoid, strongly muscled, with a narrow opening of the outer coat cavity, and the body surface is generally not porous. Carapace suckers in 1 or 2 rows. Male left or right 3rd carpus cauline, ventral margin of carpus with spermatic groove, terminal spoon-like clypeus lobe; cauline carpus not self-breaking. Funnel coat lock reduced. With 1 pair of reduced needle-like inner shells or without inner shells. Lateral teeth of the clypeus generally unicuspidate if clypeus is present. Stomach and cecum located posterior to digestive gland.
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