Until recently considered conspecific with D. sanctithomae; separated on basis of vocal, behavioural and morphological differences. Race concolor sometimes treated as a separate species, but vocal and morphological data suggest that it is instead a pale, weakly barred representative of present species; characters of birds from R Tapajós E to R Tocantins (NC Brazil), described as race ridgwayi, apparently represent introgression between concolor and medius. Birds from E Peru showing characters of polyzonus may instead reflect hybridization between radiolatus and juruanus. One study indicated genetic differences between radiolatus and concolor as great as or greater than those between it and D. sanctithomae. In recent study establishing taxon retentus (as full species)#R, all subspecies were proposed as full species (on weak genetic basis, and even though loudsongs apparently all similar), but such treatment not justified under BSC criteria. Seven subspecies recognized.
Food and feeding
Status and conservation
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