Aacocrinus, also known as the feather star, is a genus of extinct sea lily from the Actinocrinitidae (or Patelliocrinidae) family. It has been shown that it was an attached stationary organism that blindly fed on passing organism. It was composed of Mg calcite and its habitat included the upper-level epifauna. There are currently 14 species within this genus:
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