Semionotus
| Semionotus | |
|---|---|
| Fossils of S. bergeri | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Clade: | Ginglymodi |
| Order: | †Semionotiformes |
| Superfamily: | †Semionotoidea |
| Family: | †Semionotidae |
| Genus: | †Semionotus Agassiz, 1843 |
Semionotus (from Greek: σημιον semion, 'mark' and Greek: νῶτος nôtos, 'back') is an extinct genus of ray-finned fish found throughout Northern Pangaea (North America and Europe) during the late Triassic, becoming extinct in the Early Jurassic.