Kroh, A.; Mooi, R. (2025). World Echinoidea Database. Pygastrides relictus (Lovén, 1874). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=569568 on 2025-04-17
basis of recordMortensen, T. (1948). A Monograph of the Echinoidea. IV, 1 Holectypoida, Cassiduloida. 371 pp., C. A. Reitzel, Copenhagen. page(s): 303-306 [details]
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