| Nybyoceras Temporal range: M- U Ordovician
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | †Actinocerida |
| Family: | †Armenoceratidae |
| Genus: | †Nybyoceras Troedsson, 1926 |
Nybyoceras is an actinocerid genus assigned to the Armenoceratidae and similar to Armenoceras except for having a siphuncle close to the ventral side of the shell.