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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.
were predatory mollusks that resembled squid. These cephalopods had eyes, tentacles, and spiral shells. They are more closely related to a living octopus, though the shells resemble that of a nautilus. Ammonites first appearing in the fossil record 240 million years ago, descending from straight shelled cephalopods.