Usually treated as conspecific with Z. poliogastrus, but see comments under that species. Differs from poliogastrus by its much more extensive yellow forehead (2); deep olive-green vs buffy-grey flanks (3); yellow vs whitish belly (3); and larger eyering (mensural character; 2); from Z. kaffensis by its much more extensive yellow forehead (2); deep vs pale olive-green flanks (2); paler yellow throat (1); and larger eyering (2); from Z. kulalensis by its much more extensive yellow forehead (2); deep olive-green vs grey flanks (3); larger eyering (1); and smaller size (bill and wing; at least 1); and from Z. silvanus, Z. eurycricotus, Z. mbuluensis and Z. winifredae in characters given under those species. Recent research suggests most of these taxa are also vocally distinct from one another#R, but work needed to assess levels of divergence. Monotypic.
C Kenyan highlands from Meru district, Mt Kenya and Aberdare Mts S to Nairobi.
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