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Section of Chambered Nautilus explaining its features and characteristics at Science Museum in Guwahati. The chambered nautilus is a mollusk, related to the octopus, squid, clam and snail. A nautilus, along with the cuttlefish, squid, and octopus, are all cephalopods, meaning "head-foot," so named because the feet (tentacles) are attached to the head. The nautilus is the only cephalopod that has a fully developed shell for protection. Unlike a squid, cuttlefish or an octopus, the nautilus has poor vision and its primitive eyes have no lenses. The nautilus has more than 90 suckerless tentacles. Grooves and ridges on the tentacles are used to grip prey and deliver food to a crushing, parrot-like beak. Unlike snails, the spiraled shell of the nautilus is divided into chambers with the animal
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