 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (May 2018) |
| Tomognathus Temporal range:
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| Restoration of T. gigeri at Muséum départemental du Var (France) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Clade: | Halecomorphi |
| Order: | Amiiformes |
| Family: | †Tomognathidae Jordan, 1923 |
| Genus: | †Tomognathus Dixon, 1850 |
| Species | |
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Tomognathus was a halecomorph fish related to the modern bowfin that lived in the Cretaceous Period. It was named by Dixon in 1850.
The name Tomognathus was also later applied to a modern species of ant by Mayr in 1861. But since the name was already taken it came instead to be classified as Harpagoxenus.