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This species is probably the most common nautilus. The chambered nautilus also has small tentacles that it uses to swim or pull itself along rocks. In the daytime it descends about 2,000 ft (610 m) into the deep and at night it rises to a depth of 300â500 ft (90â150 m) to feed. The nautilus has an unusually long life span for a cephalopod; it may live for more than 15 years.
Bivalves are exclusively aquatic; they include both marine and freshwater forms. However some, for instance the mussels, can survive out of water for short periods by closing their valves. Bivalves are unique among the mollusks for lacking a radula; they feed by siphoning and filtering large particles from water. Some bivalves are epifaunal: that is, they attach themselves to surfaces in the water, by means of a byssus or organic cementation. Others are infaunal: they bury themselves in sand or other sediments.