original description
(of Plexechinus nordenskjoldi Mortensen, 1905) Mortensen, T. 1905. Some new species of Echinoidea. Videnskabelige Meddelelser fra den naturhistoriske Forening i Kjøbenhavn, Series 6 7, 241-243. [details] 
context source (Deepsea)
De Ridder C., David B. & Larrain A. (1992). Antarctic and Subantarctic echinoids from "Marion Dufresne" expeditions MD03, MD04, MD08 and from the "Polarstern" expedition Epos III. Bulletin du Museum national d'Histoire naturelle., 14A, 2, 405-441. [details]
basis of record
David, B., T. Choné, A. Festeau & C. de Ridder (2004). Antarctic Echinoids, an Interactive Database. Editions Universitaires Dijon. Cd Rom. (look up in IMIS) [details]
new combination reference
Mooi, R. & David, B. 1996. Phylogenetic analysis of extreme morphologies: deep-sea holasteroid echinoids. Journal of Natural History 30, 913-953., available online at https://doi.org/10.1080/00222939600770501
page(s): 946 [details] Available for editors 
From editor or global species database
Unreviewed