Genus
Nonparactocrinus Arendt, 1976
List of species
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Echinodermata |
| Subphylum | Pelmatozoa |
| Class | Crinoidea |
| Order | Hemistreptocrinida |
| Family | Hemistreptocrinidae |
| Genus | Hemistreptocrinus |
| Nonparactocrinus | |
| Species | laevis |
| Genus | Parorthocrinus |
| Tetractocrinus |