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We document the first records for Guyana of Roraiman Antbird (Percnostola [Schistocichla] “leucostigma” saturata), an endemic of the tepui highlands of southeastern Venezuela, northern Brazil and western Guyana. This form is well differentiated from nominate leucostigma (Spot-winged Antbird) of the Guianan lowlands in morphology, vocalizations, and genetics, and replaces it both altitudinally and ecologically. The two taxa are distributed parapatrically on the continuously forested northeastern slopes of the eastern tepuis, and they almost certainly come into contact, yet there is no evidence of intermediacy. We recommend that saturata be treated as a distinct species of Percnostola, and consider its' origin in the light of various models of speciation in the tepuis.  Especiación de Aves en el Pantepui: El Caso de Percnostola (Schistocichla) “leucostigma” saturata  Resumen. En este trabajo documentamos los primeros registros para Guyana de Percnostola (Schistocichla) “leucostigma” saturata, un hormiguero endémico de las montañas del sureste de Venezuela, norte de Brazil y oeste de Guyana. Esta forma se diferencia notablemente en morfología, vocalizaciones y genética de P. l. leucostigma, presente en las tierras bajas de las Guyanas, y la reemplaza altitudinal y ecológicamente. Los dos taxa tienen distribuciones parapátricas en los bosques continuos de las laderas noreste de los tepuis del este, y casi con seguridad están en contacto, aunque no hay señales de hibridización. Recomendamos que saturata sea tratada como una especie distinta de Percnostola, y discutimos su origen considerando varios modelos de especiación en los tepuis.

Avian Speciation in the Pantepui: The Case of the Roraiman Antbird (Percnostola [Schistocichla] “Leucostigma” Saturata)