Kroh, A.; Mooi, R. (2021). World Echinoidea Database. Cassidulus (Pygorhynchus) carolinensis Twitchell in Clark & Twitchell, 1915 †. Accessed at: http://marinespecies.org/echinoidea/aphia.php?p=taxdetails&id=754748 on 2024-04-18
basis of recordKier, P. M. & Lawson, M. H. 1978. Index of living and fossil echinoids 1924-1970. Smithsonian Contributions to Paleobiology 34, 1-182., available online athttps://doi.org/10.5479/si.00810266.34.1 page(s): 78 [details] Available for editors
status sourceCooke, C. W. 1959. Cenozoic echinoids of eastern United States. United States Geological Survey Professional Papers 321, III+1-106., available online athttps://pubs.usgs.gov/pp/0321/report.pdf page(s): 60 [details]
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