Echinoidea taxon details
original description
(of Cassidulus eugeniae Lovén, 1874) Lovén, S. 1874. Études sur les échinoïdées. Kongelige Svenska Vetenskaps-Akademiens Handlingar 11, 1-91., available online at https://www.biodiversitylibrary.org/page/27525491 page(s): 6; pl. 7: fig. 66, pl. 15: fig. 130 [details] 
original description
(of Pygorhynchus pacificus A. Agassiz, 1863) Agassiz, A. (1863). List of the echinoderms sent to different institutions in exchange for other specimens, with annotations. <em>Bulletin of the Museum of Comparative Zoölogy at Harvard College.</em> 1: 17-28. page(s): 27 [details] 
additional source
Mooi, R. 1990. Living cassiduloids (Echinodermata: Echinoidea): A key and annotated list. Proceedings of the Biological Society Washington 103, 63-85. page(s): 82 [details]
From editor or global species database
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