Genus
Horridonia Chao, 1927
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Brachiopoda |
| Subphylum | Rhynchonelliformea |
| Class | Strophomenata |
| Order | Productida |
| Suborder | Productidina |
| Superfamily | Productoidea |
| Family | Productidae |
| Subfamily | Leioproductinae |
| Tribe | Horridoniini |
| Genus | Horridonia |
| Species | horridus |