Species included under the names Ptychadena neumanni and P. erlangeri in previous studies. Species names within the circles correspond to the revised taxonomy. Left (yellow) and right (blue) circles contains all species identified as P. neumanni and P. erlangeri, respectively, since their original descriptions Ahl (1924). Species at the intersection of the two circles were identified as both species either in different studies (e.g., Largen 2001; Freilich et al. 2014; Smith et al. 2017a, b; Reyes-Velasco et al. 2018) or within the same study (e.g., Largen 2001). The full taxonomic history of the group is summarized in Suppl. material 3: Table S6.