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Subspecies (2)

• Myrmotherula assimilis assimilis

  river islands and river edge of western Amazonia: Amazon River of Peru (east from the lower Río Marañón), Amazonian Brazil (Amazon River eastward to the Amazonas-Pará border, also the Rio Madeira and the lower portions of Rio Negro, Rio Juruá, and Rio Purus), and northern Bolivia (lower Río Beni and Río Guaporé)

• Myrmotherula assimilis transamazonica

  Amazonian Brazil, along the Amazon River in far western Pará (east to the mouth of the Rio Tapajós)