Breure, A. S. H., and F. J. Borrero. “An Annotated Checklist of the Land Snail Family Orthalicidae (Gastropoda: Pulmonata: Orthalicoidea) in Ecuador, With Notes on the Distribution of the Mainland Species”. Zootaxa, vol. 1768, no. 1, May 2008, pp. 1–40, doi:10.11646/zootaxa.1768.1.1.