Kroh, A.; Mooi, R. (2024). World Echinoidea Database. Clypeaster (Orthanthus) cyclopilus H.L. Clark, 1941. Accessed through: World Register of Marine Species at: https://marinespecies.org/aphia.php?p=taxdetails&id=513746 on 2024-10-15
basis of recordMortensen, T. (1948). A Monograph of the Echinoidea. IV, 2. Clypeasteroida. Clypeasteridæ, Arachnoidæ, Fibulariidæ, Laganidæ and Scutellidæ. 471 pp., C. A. Reitzel, Copenhagen. page(s): 48-49 [details]
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