"Although notable taxonomic difficulties remain in Pyxicephalus, particularly in distinguishing P. adspersus and P. edulis from throughout all regions of Africa, this issue does not affect the recognition of P. angusticeps, the type material of which is distinct from P. adspersus, P. obbianus, and the type material of P. edulis. We thus consider P. angusticeps as valid. A full generic revision, based on DNA sequence data, advertisement calls, morphometrics, external morphology and osteological data, will clarify outstanding issues in the taxonomy of Pyxicephalus."
Zootaxa 3599 (3) 201-228
This species is endemic to the coastal lowlands of eastern Africa (Kenya, Tanzania, and Mozambique). Originally, Dr. Charles Parry named this species back in 1982. Unfortunately, the genus Pyxicephalus seems to be in turmoil right now so I believe there may be additional species named very soon. It's good to see that P. angusticeps has been validated again!