Dronen, N.O., Blend, C.K. and Davis, A.J. 2004. Emendation of the subfamilies Caiguiriinae and Pygidiopsinae (Digenea) with a redescription of Caiguiria anterouteria (Digenea: Heterophyidae) and reassignment of Pygydiopsis crassus to Caiguiria. Zootaxa. 417, 1 (Jan. 2004), 1–12. DOI:https://doi.org/10.11646/zootaxa.417.1.1.