World Register of Marine Species (WoRMS)
MolluscaBase eds. (2026). MolluscaBase. Opeas rarum (K. Miller, 1879). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1064075 on 2026-08-29
Miller, K. (1879). Die Binnenmollusken von Ecuador. Malakozoologische Blätter, Neue Folgen. 1: 117-203, pls 4-15.