Alphacrinus is an extinct genus of crinoid which existed during the early Ibexian period. It was named by Thomas E. Guensburg in 2010, and placed into its own family, Alphacrinidae. The type species is Alphacrinus mansfieldi.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0