World Register of Marine Species (WoRMS)
Plexechinus nordenskjoldi Mortensen, 1905
Kroh, A.; Mooi, R. (2026). World Echinoidea Database. Plexechinus nordenskjoldi Mortensen, 1905. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=174989 on 2026-08-01
Mortensen, T. 1905. Some new species of Echinoidea. Videnskabelige Meddelelser fra den naturhistoriske Forening i Kjøbenhavn, Series 6 7, 241-243.