I would say male, based on forearm thickness. For doubters of this fact, see Kenton Wells (2007) The Ecology and Behavior of Amphibians, University of Chicago Press, Chicago and London (a fantastic detailed book), pages 394 to 395. Wild caught adult males of Pyxicephalus have nuptial pads when in breeding condition, but I don't know if Pyxis get these in captivity? Do they? This is a transient feature in many frogs.
Head width doesnt work well to determine sex in Pyxicephalus, really. It does vary with size and species, though. The specific name for the Tanzanian frog is P. angusticeps. The specific epithet means 'narrow head'. The West African form (whose name shall be P. maltzanii Boulenger 1882) also does not get such wide heads, either. So there is more going on with head width then is currently properly documented. However, many (or most) of the pet-trade animals appear to be hybrids, and some are of West African origin, or bred from West African stock.





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