Lago-Barcia, D., & Carbayo, F. (2018).

Taxonomic revision of four species of the Neotropical land planarian genera Cratera and Geoplana (Platyhelminthes, Tricladida) with a description of two new species and an emendation of Cratera

. Zootaxa, 4500(4), 517–542. https://doi.org/10.11646/zootaxa.4500.4.3