References and links: Mortensen T. (1950b): A monograph of the Echinoidea. Vol.5(1) Spatangoida I. C.A. Reitzel, Copenhagen: 1-432; pages: 111-113. Lessios, H. A. (2005). Echinoids of the Pacific Waters of Panama: Status of knowledge and new records. Rev. Biol. Tropical 53 (sup. 3):147-170. The Echinoid Directory World Echinoidea Database LSID urn:lsid:marinespecies.org:taxname:124360 Synonymised taxa: Urechinus naresi (misspelling of Urechinus naresianus) Distribution: This species is recorded from the eastern Pacific of Panama, with a depth range of 755 to 4400 m (see Lessios, 2005).