Cyclurus
| Cyclurus Temporal range: Possible Campanian occurrence | |
|---|---|
| Fossil of C. kehreri | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Clade: | Halecomorphi |
| Order: | Amiiformes |
| Family: | Amiidae |
| Subfamily: | Amiinae |
| Genus: | †Cyclurus Agassiz, 1844 |
| Type species | |
| †Cyclurus valenciennesi Agassiz, 1844 | |
| Species | |
|
See text | |
| Synonyms | |
Cyclurus (Ancient Greek for "rounded tail") is an extinct genus of freshwater amiid ray-finned fish known from the Late Cretaceous to the Early Oligocene across much of the Northern Hemisphere. It is thought to be the closest relative of the extant bowfins in the genus Amia, although species of Cyclurus were significantly smaller in size compared to Amia.