Eucidaris tribuloides (Slate-pencil Urchin).jpg
Taxonomy database of the U.S. National Center for Biotechnology Information
Global Biodiversity Information Facility
Interim Register of Marine and Nonmarine Genera
Reports on the scientific results of the Atlantis expeditions to the West Indies under the joint auspices of the University of Havana and Harvard University : the echinoderms (other than holothurians)
The Echinoderm Fauna of the Azores (NE Atlantic Ocean)