Traits taxon details
original description
Paulson, Jr. O. L. 1958. A New Species of the Eocene Echinoid Periarchus. Journal of Paleontology 32, 362-365. page(s): 362-365; figs. 5-6, 8 [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): 67 [details] Available for editors 
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