| Ischnacanthus Temporal range: Early Devonian |
|
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Subphylum: | Vertebrata |
| Infraphylum: | Gnathostomata |
| Class: | Acanthodii |
| Order: | Ischnacanthiformes |
| Family: | Isnacanthidae |
| Genus: | Ischnacanthus |
| Species: | I. gracilis |
Ischnacanthus is an extinct genus of fish in class of Acanthodii. Ischnacanthus lived during the Early Devonian period. The Ischnacanthus have jaws but still have small mosaic scales. They either had very small teeth or none. Fossils were found in Tillywhandland Quarry, Forfar, Scotland.