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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.
The ancestral mollusc is thought to have had a shell, but this has subsequently been lost or reduced on some families, such as the squid, octopus, and some smaller groups such as the caudofoveata and solenogastres, and the highly derived Xenoturbella.owever there are many species of gastropod mollusc in which the shell is somewhat reduced or considerably reduced, such that it offers some degree of protection only to the visceral mass, but is not large enough to allow the retraction of the other soft parts.