Malacca, Peninsular Malaysia.
Has been placed in genus Malacocincla or in Pellorneum. See remarks under T. cinereiceps. Populations in parts of Borneo have been regarded as subspecifically distinct, but variation slight and probably clinal; proposed races sordida (NE Borneo) and saturata (Bangka, Belitung, and W Borneo) both considered synonymous with poliogene, but at least first-named is genetically very distinct#R and multiple cryptic species potentially involved#R. Proposed race feriata (from Mt Mulu, in NW Borneo), based on single specimen, has characters apparently exhibited by juveniles of this species. Two subspecies recognized.
Food and feeding
Status and conservation
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