Myrmotherula menetriesii berlepschi Hellmayr, 1903

Isler, Morton L., Chesser, R. Terry, Stryjewski, Katherine Faust & Whitney, Bret M., 2025, Systematics of three pan-Amazonian antwren lineages (Aves: Passeriformes: Thamnophilidae: Myrmotherula and Isleria), Zootaxa 5722 (1), pp. 45-78 : 62

Myrmotherula menetriesii berlepschi Hellmayr, 1903

Includes the study population designated berlepschi in the analysis.

Diagnosis. Female upperparts Olive Brown (between 2.5Y4/4 and 2.5Y5/6); underparts Brownish Yellow (10YR6/8, paler on breast), differing diagnosably from the nominate in brown rather than gray coloration.

Distribution. Bounded on the northeast in the region between the lower Rio Madeira/lower Rio Aripuanã/lower Rio Roosevelt and the headwaters of the Rio Teles Pires; on the northwest by the upper Rio Madeira, and on the south by Amazonian forest limits extending to extreme northeastern Bolivia.

Remarks. M. m. berlepschi is considered a subspecies of Myrmotherula menetriesii s.s., rather than a species, based on similarity of vocalizations and male plumage, whereas designation as a subspecies is based on female coloration distinctly browner than that of nominate M. menetriesii . Subspecies status is supported by a mtDNA genetic distance of ~2.9% with the nominate form. The intersection of the geographic ranges of M. menetriesii berlepschi and M. omissa is unclear and awaits field exploration.