Nautilus clarkanus
| "Nautilus" clarkanus Temporal range: Carboniferous | |
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Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | Nautilidae |
| Genus: | Nautilus |
| Species: | †N. clarkanus |
| Binomial name | |
| †Nautilus clarkanus Hall, 1858 | |
"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.
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