Genus
Parexus Agassiz, 1844
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Infraphylum | Gnathostomata |
| Class | Acanthodii |
| Order | Climatiiformes |
| Family | Climatiidae |
| Genus | Cheiracanthoides |
| Climatius | |
| Parexus | |
| Species | recurvus |
| Genus | Pruemolepis |
| Tareyacanthus | |
| Watsonacanthus |