perekond
Trigonocyclicus Yeltyschewa, 1963
Klassifikatsioon
| organismirühm | Biota |
| domeen | Eukaryota |
| riik | Animalia |
| hõimkond | Echinodermata |
| klass | Crinoidea |
| organismirühm | Stemmed echinoderms outgroup (informal) |
| selts | Angulata (col.) |
| sugukond | Crenatocrininidae |
| Cyclomischidae | |
| Cyclopagodidae | |
| perekond | Acanthodocrinus |
| Constrictocrinus | |
| Cyclocyclicus (col.) | |
| Irucrinus (col.) | |
| Pentagonocyclicus (col.) | |
| Rookuelacrinus | |
| Rugulosocrinus | |
| Trigonocyclicus | |
| Vialovicystis |