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A Distinctive New Subspecies of Scytalopusgriseicollis (Aves, Passeriformes, Rhinocryptidae) From the Northern Eastern Cordillera of Colombia and Venezuela

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A Distinctive New Subspecies of Scytalopusgriseicollis (Aves, Passeriformes, Rhinocryptidae) From the Northern Eastern Cordillera of Colombia and Venezuela

Jorge Enrique Avendaño et al. Zookeys.

Abstract

We describe a new subspecies of Pale-bellied Tapaculo Scytalopusgriseicollis from the northern Eastern Cordillera of Colombia and Venezuela. This form differs diagnosably in plumage from described subspecies Scytalopusgriseicollisgriseicollis and Scytalopusgriseicollisgilesi and from the latter in tail length. It is also differentiated non-diagnosably in voice from both these populations. Ecological niche modelling analysis suggests that the new subspecies is restricted to the Andean montane forest and páramo north of both the arid Chicamocha valley and the Sierra Nevada del Cocuy.

Keywords: Andes; Tamá; endemism; geographic variation; inter-Andean valley; páramo.

Figures

Figure 1.
Figure 1.
Dorsal and ventral views of three subspecies of Scytalopus griseicollis found in the Eastern Cordillera of Colombia and Venezuela and Scytalopus perijanus from the Serranía de Perijá. From left to right. Scytalopus griseicollis griseicollis (ICN 31235); Scytalopus griseicollis gilesi (ICN 36901); Scytalopus griseicollis morenoi (holotype); and Scytalopus perijanus (ICN 36745). Note the distinctive browner back and nape of the new subspecies.
Figure 2.
Figure 2.
Ventral and lateral views of fledglings of three subspecies of Scytalopus griseicollis and Scytalopus perijanus found in Colombia and Venezuela. A Scytalopus griseicollis morenoi (MLS 3993) B Scytalopus griseicollis morenoi (IAvH-A 14948); C Scytalopus griseicollis griseicollis (IAvH-A 13935) D Scytalopus griseicollis griseicollis (ICN 35441) E Scytalopus griseicollis gilesi (ICN 36916) F Scytalopus perijanus (ICN 36734). Note the darker plumage and ventral white scalloping in Scytalopus griseicollis morenoi.
Figure 3.
Figure 3.
Selected specimens of the type series of Scytalopus griseicollis morenoi. From left to right: holotype (ICN 37538), male paratype (ICN 37514), male paratype (ICN 37570), male paratype (ICN 37548), and female paratype (ICN 37516). Note the slight individual variation in the color of the underparts and upperparts.
Figure 4.
Figure 4.
Spectograms of scolds of Scytalopus griseicollis subspecies found in Colombia and Venezuela. Scytalopus griseicollis morenoi: A Oirá River, border with Colombia, Apure state, Venezuela (XC6079, C. Parrish) B Páramo de Santurbán, Vetas, Santander department, Colombia (XC117002, O. Cortés). Scytalopus griseicollis gilesi C vereda Alto Cantagallos, San Vicente de Chucurí, Santander department, Colombia (XC18457, T. M. Donegan) D Lepipuerto, El Carmen de Chucurí/Simacota, Santander department, Colombia (XC18477, T. M. Donegan). Scytalopus griseicollis griseicollis E Chingaza NP, Cundinamarca department, Colombia (XC79989, A. Spencer) F Iguaque, Boyacá department, Colombia (XC119700, D. Edwards). Spectrograms were made in Syrinx v2.6h (Burt 2006) applying the same parameters except for adjusting brightness to improve note resolution.
Figure 5.
Figure 5.
Spectograms of reeling songs of Scytalopus griseicollis subspecies found in Colombia and Venezuela. Scytalopus griseicollis morenoi: A Las Picotas, vereda Angosturas, Vetas, Santander department, Colombia (XC86713, J. E. Avendaño) B Oirá River, border with Colombia, Apure state, Venezuela (XC16658, C. Parrish). Scytalopus griseicollis gilesi C Filo Pamplona, vereda La Aurora, Galán, Santander department, Colombia (XC18454, T. M. Donegan) D Lepipuerto, El Carmen de Chucurí/Simacota, dpto. Santander, Colombia (XC18472, T. M. Donegan). Scytalopus griseicollis griseicollis E Chingaza NP, dpto. Cundinamarca, Colombia (XC102520, F. Schmitt) F (first part of song) Reserva de Aves para Amazilia castaneiventris y Macroagelaius subalaris, Soatá, dpto. Boyacá, Colombia (XC94523, O. Cortés).
Figure 6.
Figure 6.
Potential distribution (in green, defined as ≥0.44 presence probability calculated in MAXENT) for three subspecies of Scytalopus griseicollis in the Eastern Cordillera of Colombia and Venezuela. Note the restricted potential range of Scytalopus griseicollis morenoi to the northern section of the Eastern Cordillera. Bold letters correspond to some potential barriers or geographic locations mentioned in the text: A Táchira depression B Sierra Nevada del Cocuy C Chicamocha River canyon; and D Horta-Opón Rivers depression. Locality records by subspecies are depicted by colored circles.

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References

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