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Question: What is the only existing cephalopod with a shell?
Answer: Nautilus
Content analysis:
1. Nautilus: It is the general name for marine mollusks of the class Cephalopod and the family Nautilus;
2. There are 2 genera and 6 species, with curled pearl-like shells. The maximum shell size can be 26.8 cm, but adult nautiluses generally do not exceed 20 cm;
3. The large-umbilical nautilus is the smallest species in the nautilus family, generally only 16 centimeters. The casing consists of a number of chambers with a jacket located inside the casing.
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