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- The nautilus is an ancient pelagic marine mollusc of the cephalopod family Nautilidae.
- The nautilus is the sole extant family of the superfamily Nautilaceae and the suborder Nautilina.
- Nautilidae, both extant and extinct, are characterized by involute or more or less convolute shells that are generally smooth, with compressed or depressed whorl sections, straight to sinuous sutures, and a tubular, generally central siphuncle.
- Having survived relatively unchanged for hundreds of millions of years, nautiluses represent the only living members of the subclass Nautiloidea, and are often considered "living fossils".
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