Theelia is an extinct genus of sea cucumber which existed from 312 to 40.4 million years ago (Middle Pennsylvanian to the Lutetian age). Fossil sclerites of Theelia are found worldwide.
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