Rödel, M.-O., Schmitz, A., Penner, J., Griesbaum, F., Leaché, A.D., Ofori-Boateng, C., Portik, D., Doumbia, J., Kouamé, N.G., Kpan, T.F., Gonwouo, N.L., Nopper, J., Hillers, A., Nago, S.G.A., Ernst, R., Glos, J., Petzold, A. and Barej, M.F. 2026. Four new cryptic Ptychadena species from the Upper Guinean rainforests of West Africa (Amphibia, Anura, Ptychadenidae). Zootaxa. 5779, 1 (Mar. 2026), 1–66. DOI:https://doi.org/10.11646/zootaxa.5779.1.1.