Undulated Antshrike (Frederickena unduliger) [XC597295]
by Jerome Fischer from Reserva Natural Palmar\u00ed, Rio Javar\u00ed, AM, Brazil (song)
Undulated Antshrike (Frederickena unduliger) [XC821650]
by id from Linha C-1, Porto Velho-Humait\u00e0 road, Rond\u00f4nia, Brazil (call)
Subspecies
Genus presumed related to Thamnophilus on basis of external morphology, especially the strongly hooked bill, but supporting molecular or other evidence unavailable. Considered to form a superspecies with Black-throated Antshrike (Frederickena viridis). Subspecies defined on basis of female plumages, but racial assignment of specimens often difficult because of extensive individual (though possibly age-related) variation, even among females from same locality; geographical limits of fulva and diversa are based on preliminary vocal analysis. Re-examination of taxa required, and molecular and vocal analysis likely to prove most useful.
The following 4 subspecies are recognised:
unduliger (Pelzeln, 1868) - North-western Amazonian Brazil on upper R Negro, possibly extending south to northern bank of R Solimíµes.
fulva J. T. Zimmer, 1944 - South-eastern Colombia (eastern Cauca, western Caquetá, western Putumayo), eastern Ecuador and eastern Peru (north of R Marañón and R Amazon), possibly extending eastern into Brazil (Amazonas north of R Solimíµes). Considered by some authors to be a distinct species, Fulvous Antshrike (Frederickena fulva).
diversa Zimmer, JT, 1944 - Eastern Peru (south of R Marañón and R Amazon) and north-western Bolivia (southern La Paz, extreme southern Beni).
pallida Zimmer, JT, 1944 - South-western Amazonian Brazil (Amazonas south of R Amazon), probably also north-central Bolivia (eastern Pando).
BirdLife International Species Factsheet