Geisonocerina
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| Geisonocerina Temporal range: Ordovician-Permian | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Order: | †Orthocerida |
| Family: | †Geisonoceratidae |
| Genus: | †Geisonocerina Foeste 1935 |
Geisonocerina is an extinct genus from the carnivorous nautiloid cephalopod order Orthocerida that lived in what would be North America, Europe, and Asia during the Ordovician through Permian from 449 to 290 mya, existing for approximately 159 million years.
