This species is recorded from the Caribbean coast of Panama (see Alvarado et al., 2008).
Mortensen, T. (1948). A monograph of the Echinoidea 4(1). Holectypoida, Cassiduloida. Copenhagen. 371 pp; pages: 205-210.
Kier, P. M. (1962). Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections 144 (3) 262 pp.
Alvarado, J.J., F.A. Solis-Marin & C. Ahearn. (2008). Equinodermos (Echinodermata) del Caribe Centroamericano. Rev.Biol.Trop. 56 (Suppl. 3): 37-55.
LSID urn:lsid:marinespecies.org:taxname:513159Cassidulus (Rhyncopygus) caribaearum Lamarck, 1816 (unaccepted combination)
Cassidulus australis Lamarck, 1816 (subjective junior synonym)
Cassidulus guadaloupensis Duchassaing, 1847 (subjective junior synonym)
Cassidulus richardii Deslongchamps, 1824 (subjective junior synonym)
Rhyncholampas caribaearum (Lamarck, 1816) (unaccepted combination)
Rhynchopygus caribaearum (Lamarck, 1816) (unaccepted combination)