| Cyrtoceras Temporal range: Late Late Cambrian–Middle Devonian[1] |
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|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Oncocerida |
| Genus: | Cyrtoceras |
Cyrtoceras is an extinct genus of oncoceridan nautiloid that lived from the middle Ordovician to the middle Devonian, in Africa, Europe, North America, and South America.