Family Typical Antbirds (Thamnophilidae)

Least Concern

Leaden Antwren (Myrmotherula assimilis)


French: Myrmidon plombé German: Várzeaameisenschlüpfer Spanish: Hormiguerito plomizo

Myrmotherula assimilis


, 1868,

Rio Amajaú, Rio Negro, Brazil


Relationships uncertain. Results of one genetic study suggest that this species is not closely related to any others in the genus. Two subspecies recognized.

Subspecies and Distribution
  • M. a. assimilis Pelzeln, 1868 – rivers of W & C Amazonia in Peru (E from lower R Marañón), Brazil (E to Amazonas–Pará border, including R Solimões, R Madeira and lower portions of R Negro, R Juruá and R Purus) and N Bolivia (lower R Beni and R Guaporé).
  • M. a. transamazonica Gyldenstolpe, 1951 – R Amazon in extreme W Pará (E to mouth of R Tapajós).
  • Descriptive notes

    9–10 cm; 8·5–9·5 g. Male is grey, paler below; large white interscapular patch; wing-coverts slightly darker grey, narrowly edged white, tail rather narrowly... read more


    Loudsong a trill of extremely rapidly delivered notes (e.g. 55 notes, 3·5 seconds),... read more


    Understorey and mid-storey of lowland evergreen forest and adjacent scrub at river edges. Occurs in... read more

    Food and feeding

    Little published. Feeds on various insects, particularly orthopterans and adult and larval lepidopterans; probably also on spiders. Clips... read more


    Nothing known. Adult male seen to feed begging juvenile on 11th Oct in Brazil (Anavilhanas Archipelago, on R Negro).


    None recorded; presumed resident throughout range.

    Status and conservation

    Not globally threatened. Fairly common but patchily distributed throughout its narrow, somewhat linear range, which extends along much of R Amazon and portions of its major... read more

    Recommended citation

    Zimmer, K. & Isler, M.L. (2020). Leaden Antwren (Myrmotherula assimilis). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 24 February 2020).