Dronen, N. O., Blend, C. K., & 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), 1–12. https://doi.org/10.11646/zootaxa.417.1.1