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1 November 2010 Revising Species Limits in a Group of Myrmeciza Antbirds Reveals a Cryptic Species Within M. Laemosticta (Thamnophilidae)
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The magnitude of differentiation in vocal signals examined in a phylogenetic context has helped uncover cryptic diversity in subsocine passerines such as the antbirds (Thamnophilidae). On the basis of variation in 14 acoustic traits of loudsongs and a phylogenetic hypothesis inferred from a mitochondrial gene tree, we investigated species limits in a group of trans-Andean Myrmeciza antbirds with a convoluted taxonomic history (M. l. laemosticta, M. l. palliata, M. nigricauda, and M. berlepschi). Diagnostic differences in three vocal traits suggest that the two subspecies of the Dull-mantled Antbird (M. l. laemosticta and M. l. palliata) should be treated as distinct species. We present evidence that only two diagnosable vocal characters may be sufficient for two populations to be considered distinct species in this group. The vocal results are consistent with the molecular phylogenetic analysis, which revealed a long independent history of isolation of M. l. laemosticta from M. l. palliata, roughly congruent with the divergence observed between species currently recognized in this assemblage. We propose elevating the Magdalena Antbird (M. palliata) to species rank and thus that four species be recognized in the M. laemosticta complex.

© 2010 by The Cooper Ornithological Society. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press's Rights and Permissions website,
Juan Camilo Chaves, Andrés M. Cuervo, Matthew J. Miller, and Carlos Daniel Cadena "Revising Species Limits in a Group of Myrmeciza Antbirds Reveals a Cryptic Species Within M. Laemosticta (Thamnophilidae)," The Condor 112(4), 718-730, (1 November 2010).
Received: 13 May 2010; Accepted: 1 June 2010; Published: 1 November 2010

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