Onychocrinus
| Onychocrinus Temporal range: | |
|---|---|
| Fossil of Onychocrinus species from Carboniferous of United States | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Crinoidea |
| Order: | †Taxocrinida |
| Family: | †Synerocrinidae |
| Genus: | †Onychocrinus Lyon and Casseday, 1860 |
Onychocrinus is an extinct genus of feathered crinoids that lived during the Carboniferous period, approximately 353.8 to 318.1 million years ago. It belonged to the family Synerocrinidae.