A large forest Afrixalus (males 25–34 mm, females 30–38 mm) from R. D. Congo. The pattern is rather constant with an almost square dark dorsal spot.
This form has previously been regarded as a subspecies of three other Afrixalus species (A. fornasini, A. dorsalis, A. congicus), but its status as a full species was established by Laurent (1982) and Schiøtz (1982). In habitat preference and morphology it is quite similar to the West African A. nigeriensis but it lacks the dark lumbar band which is almost always present in A. nigeriensis.
It would not be a surprise if further studies show that A. equatorialis and A. nigeriensis are subspecies of one species but, strangely enough, a vicariant to these forms (from dense forest habitats) is not known from Cameroun.
This account was taken from "Treefrogs of Africa" by Arne Schiøtz with kind permission from Edition Chimaira publishers, Frankfurt am Main.
Updated by A. Schiøtz, 2008.