Species
Ristnacrinus bifidus Stukalina, 1980
Synonyymit
1980 Ristnacrinus bifidus Stukalina, sp. nov. — Stukalina , pp. 223, fig. 1:2-4
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Echinodermata |
| Subphylum | Pelmatozoa |
| Class | Crinoidea |
| Superclass | Pentacrinoidea |
| Infraclass | Inadunata |
| Parvclass | Disparida |
| Order | Myelodactylida |
| Family | Iocrinidae |
| Genus | Ristnacrinus |
| Species | bifidus |
| kulunbulakensis | |
| marinus | |
| oepiki | |
| pusillus | |
| svedasensis | |
| tuberculatus |