Calama, Rio Madeira, Rondônia, Brazil.
Closely related to D. picumnus (sometimes treated as conspecific) and D. platyrostris, being similar to both in vocal and behavioural characters; genetic study#R found that the three form a monophyletic group, with little genetic differentiation among them; work needed to justify species rank for these taxa. In one earlier study, present species was allied with D. sanctithomae and D. certhia on basis of anatomical characters. Monotypic.
S Amazonian Brazil, S of Amazon, from R Madeira E to R Tapajós and its headwaters at R Juruena, S at least to Rondônia and SW Mato Grosso (S limit of range unclear). Alleged records farther E (to lower R Xingu) appear to refer to mislabelled specimens.
Food and feeding
Status and conservation
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