World Register of Marine Species (WoRMS)
Calaperostoma guayaquilense (G. B. Sowerby I, 1850)
MolluscaBase eds. (2026). MolluscaBase. Calaperostoma guayaquilense (G. B. Sowerby I, 1850). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1434038 on 2026-08-15
Sowerby, G. B. I. (1850). Descriptions of some additional species of Cyclostoma. In G. B. Sowerby II (ed.), Thesaurus conchyliorum, or monographs of genera of shells. Vol. 2 (11): 157*–168*, pls 31A, 31B. London, privately published.