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| Nautilus Temporal range: Triassic–present
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| Nautilus belauensis | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Infraorder: | Nautilaceae |
| Family: | Nautilidae Blainville, 1825 |
| Genera | |
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†Carinonautilus | |
| Synonyms[2] | |
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A nautilus (from Latin nautilus 'sails like a vessel'; from Ancient Greek ναυτίλος (nautílos) 'seaman, sailor')[3] [a] is any of the various species within the cephalopod family Nautilidae. This is the sole extant family of the superfamily Nautilaceae and the suborder Nautilina.
It comprises nine living species in two genera, the type of which is the genus Nautilus. Though it more specifically refers to the species Nautilus pompilius, the name chambered nautilus is also used for any of the Nautilidae. All are protected under CITES Appendix II.[7] Depending on species, adult shell diameter is between 10 and 25 cm (4 and 10 inches).
The Nautilidae, both extant and extinct, are characterized by involute or more or less convoluted shells that are generally smooth, with compressed or depressed whorl sections, straight to sinuous sutures, and a tubular, generally central siphuncle.[8] 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".
- ^ Ward, P. D.; Saunders, W. B. (1997). "Allonautilus: A New Genus of Living Nautiloid Cephalopod and Its Bearing on Phylogeny of the Nautilida". Journal of Paleontology. 71 (6): 1054–1064. Bibcode:1997JPal...71.1054W. doi:10.1017/S0022336000036039. JSTOR 1306604. S2CID 87319305.
- ^ Cichowolski, M.; Ambrosio, A.; Concheyro, A. (2005). "Nautilids from the Upper Cretaceous of the James Ross Basin, Antarctic Peninsula". Antarctic Science. 17 (2): 267. Bibcode:2005AntSc..17..267C. doi:10.1017/S0954102005002671. hdl:11336/96152. S2CID 128767860.
- ^ Lewis, Charlton T.; Short, Charles (1879). "nautĭlus or nautĭlŏs". A Latin Dictionary. Perseus Digital Library.
- ^ a b Prescott, Henry W. (October 1921). "Callimachus' Epigram on the Nautilus". Classical Philology. 16 (4). University of Chicago Press.
- ^ Liddell, Henry George; Scott, Robert (1940). "ναυτίλος". A Greek-English Lexicon. Perseus Digital Library.
- ^ Ulrich von Wilamowitz-Moellendorff (ed.). "Callimachus, Epigrams". www.perseus.tufts.edu.
- ^ "Checklist of CITES species". CITES. Retrieved 24 June 2020. (please fill in 'Nautilus' in the search-box).
- ^ Kümmel, B. 1964. Nautiloidae-Nautilida, in the Treatise on Invertebrate Paleontology, Geological Society of America and Univ of Kansas Press, Teichert and Moore eds.
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