Echinoidea taxon details
original description
Gregory, J. W. (1897). On the affinities of the Echinothuridae; and on <i>Pedinothuria</i> and <i>Helicodiadema</i>, two new genera of Echinoidea. <em>Quarterly Journal of the Geological Society of London.</em> 53: 112-122, pl. 7. [details] 
basis of record
Smith, A. B. & Kroh, A. (eds.). (2011). The Echinoid Directory. World Wide Web electronic publication., available online at http://www.nhm.ac.uk/research-curation/projects/echinoid-directory [details]
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