Genus
Onchus Agassiz, 1837
List of species
1. Onchus murchisoni Agassiz, 1837 | Ohesaare Stage
Klassificering
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Organism group | Gnathostomata |
| Class | Acanthodii |
| Order | Acanthodiformes |
| Climatiiformes | |
| Ischnacanthiformes | |
| Tchunacanthida | |
| Family | Machaeracanthidae |
| Genus | Archaeacanthus |
| Canadalepis | |
| Endemolepis | |
| Haplacanthus | |
| Homacanthus | |
| Laliacanthus | |
| Latviacanthus | |
| Minioracanthus | |
| Nodocosta | |
| Nostolepis | |
| Onchus | |
| Species | murchisoni |