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Class Cephalopoda-Octopus, Squid and Nautilus Active predators-most lack external shell (except Nautilus)Foot has evolved into a series of tentacles8 in octopus, 10 in squid, up to 90 in Nautilus Tentacles snare prey, beaklike jaws bite, radula pulls prey intomouth.
An octopus has a round head and a mantle along with eight arms. The arms are endowed with one or two rows of su... Octopuses and Squids are both head-footed aquatic animals (cephalopods) but they differ in their physical characteristics, habitat and behavior. An octopus has a round head and a mantle along with eight arms. The arms are endowed with one or two rows of su