| Acanthonus | |
|---|---|
| Bony-eared assfish (Acanthonus armatus) | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Division: | Teleostei |
| Order: | Ophidiiformes |
| Suborder: | Ophidioidei |
| Family: | Acanthonidae Wong & Chen, 2024 |
| Genus: | Acanthonus Günther, 1878 |
| Species | |
|
See text | |
| Synonyms | |
| |

Acanthonus, also known as deepsea cusk-eels, are a genus of deepwater ophidiiform fish. They are the only members of the family Acanthonidae. They were formerly placed within the subfamily Neobythiinae of the Ophidiidae.
There are three valid species:
Acanthonus spinifer Garman, 1899 accepted as Acanthonus armatus Günther, 1878
Girard, Matthew G.; Nonaka, Ai; Baldwin, Carole C.; Johnson, G. David (2024). "Discovery and description of elaborate larval cusk-eels and the relationships among Acanthonus, Tauredophidium, and Xyelacyba (Teleostei: Ophidiidae)". Early Life History and Biology of Marine Fishes: Research Inspired by the Work of H Geoffrey Moser: 20–42. doi:10.7755/pp.24.3.