Until recently considered conspecific with M. axillaris, but differs in its (in male) paler, broader vs darker, narrower grey upper and silvery-grey vs white lower flanks (3); black of mid-belly paler and more attenuated (1); (in female) ashy grey head (2); and very divergent song (drawn-out series of well-spaced slightly chirping, throaty notes on one pitch), differing in note shape, initial amplitude and frequency increase (2) and longer middle notes (1). Form described as M. fluminensis was initially thought by some to be perhaps a hybrid M. unicolor × luctuosa#R and later considered possibly a variant of luctuosa#R; recently obtained recordings of voice confirm that it is, indeed, a variant of luctuosa#R. Monotypic.
Coastal E Brazil (SE Rio Grande do Norte#R S to Rio de Janeiro).
Food and feeding
Status and conservation
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