Traits name details
basis of record
Kier, P. M. & Lawson, M. H. 1978. Index of living and fossil echinoids 1924-1970. Smithsonian Contributions to Paleobiology 34, 1-182., available online at https://doi.org/10.5479/si.00810266.34.1 page(s): 50 [details] Available for editors 
additional source
Smith, A. B. & Wright, C. W. 1999. British Cretaceous echinoids. Part 5, Holectypoida, Echinoneoida. Monographs of the Palaeontographical Society 153 (612), 342-390. page(s): 358 [details]
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