Isleria guttata ( Vieillot, 1825 )

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 : 69

Isleria guttata ( Vieillot, 1825)

Rufous-bellied Antwren

Includes the population designated guttata in the analysis.

Diagnosis. Distinctions in note structure and frequency band width distinguish Songs of I. guttata from those of I. hauxwelli ( Fig. 11), and Alarm Calls differ in the number of elements and duration ( Fig. 12). Male I. guttata differ from male I. hauxwelli in having tawny rather than gray posterior underparts and larger, pale cinnamon rather than white wing and tail spots.

Description of plumage. Male foreparts gray, throat paler; interscapular patch white; wings and tail blackish brown, remiges edged cinnamon; wing covert tips and spots on tertials and tail pale cinnamon; posterior underparts and crissum tawny. Female like male except upperparts olive gray, anterior underparts grayish olive.

Distribution. Guianan Shield and northeastern Amazonia north of the Rio Amazonas, east of the Rio Negro, and south of the Rio Orinoco.

Remarks. Specific status is supported by mtDNA genetic distance of ~7.8% between I. guttata and I. hauxwelli .