Cabanis' Greenbul (Phyllastrephus cabanisi) - HBW 10, p. 213

Taxonomy: Criniger cabanisi Sharpe, 1882, Angola.
Forms a superspecies with P. fischeri; has in the past been treated as conspecific, but differs in morphology (plumage, eye colour, bill structure) and voice, and the two recently found to occur together in Tanzania (parts of the Udzungwas). Has also been suggested that both form a superspecies with Pyrrhurus scandens (which sometimes included in present genus), but relationship seems remote. Race placidus sometimes treated as a separate species on grounds of differences in size, coloration and habitat; studies have shown, however, that its vocalizations are very similar to those of nominate (in Malawi, reacts strongly to playback of nominate from Zambia). Additional Kenyan races nandensis (from N Nandi Forest) and ngurumanensis (Nguruman Range) treated as synonyms of sucosus, as differences in coloration on which descriptions were based are small and within range of variation of last-mentioned (although birds from Nandi rather greener above, with yellow margins of flight-feathers). Three subspecies recognized.