A. inyangae is the only river frog found north of the Limpopo River which has a tympanum that is less than one half the diameter of the eye. The only other river frog north of the Limpopo is A. angolensis, which species has tympanum more than one half the eye diameter (Du Preez & Carruthers, 2009).
Diagnostic features of the A. inyangae tadpole include the absence of an elygium or umbraculum on the eye. A diagnostic range descriptor is that the tadpole is not found on the high-lying parts of the Drakensberg. Diagnostic features of the labial teeth require the tadpole to have three or four labial tooth rows in the lower jaw and four in the upper jaw. The tail fin is broad, reaching its deepest point two thirds down toward the tail, and the tail tapers to a rounded tip. A very close resemblance is to the tadpole of A. angolensis, whose lower jaw has three labial teeth rows and tail tapers to a well defined point (Du Preez & Carruthers, 2009).
As with most Ametia species, the rear one-fifth of the tadpole tail is usually not totally dark, but partially diaphanous. The spiracle is constricted, and there is usually no spur on the developing foot (Du Preez & Carruthers, 2009).
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