Number of families About 45
Mollusks bearing a radula (toothed tongue) and well-developed heads; mouth characterized by a dorsoventral pair of horny jaws known as beaks and encircled by the bases of 8-ca. 60 grasping appendages; single pair of lateral, image-forming eyes; well-developed brain and peripheral nervous system
Photo: A greater blue ringed octopus (Hapalo-chlaena lunulata) takes a crab as it emerges from its hole. (Photo ©Tony Wu/www.silent-symphony .com. Reproduced by permission.)
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