Nautilus clarkanus
| "Nautilus" clarkanus Temporal range: Carboniferous
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | Nautilidae |
| Genus: | Nautilus |
| Species: | †N. clarkanus
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| Binomial name | |
| †Nautilus clarkanus Hall, 1858
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"Nautilus" clarkanus is an extinct species of nautiloid. It lived during the Lower Carboniferous. Fossil specimens have been uncovered in the Spergen Hill Limestone formation of Indiana.
References
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