Systematics

Falco Isidori Des Murs, 1845, Revue Zoologique 1845:175. Type locality given as "Santa-Fé de Bogota" (11 Des Murs, M. O. (1845). Description de quelques espèces nouvelles d'Oiseaux. Revue Zoologiqe 1845:175-179 Close ).

Junior synonym is Spizaetus devillei Dubois, 1874, Bulletins de l'Académie Royale des Sciences, des Lettres et des Beaux-arts de Belgique 38:129 (12 Dubois, M. A. (1874). Description d'un Spizaetus nouveau. Bulletins de l'Académie Royale des Sciences, des Lettres et des Beaux-arts de Belgique 38:129-131 Close ). Later realized to be juvenile and subadult specimens of Black-and-chestnut Eagle (13 Amadon, D. (1950). What is Spizaetus devillei Dubois? Auk 67(2):235–236. Close , 14 Lehmann, F. C. (1959). Contribuciones al estudio de la fauna de Colombia XIV. Nuevas observaciones sobre Oroaetus isidori (Des Murs). Novedades Colombianas 1:169–195. Close ).

Previously, Black-and-chestnut Eagle was classified as Lophotriornis isidori, Falco isidori, and then in a monotypic genus as Oroaetus isidori. Phylogenetic analysis of DNA sequence data, from both mitochondrial and nuclear genes, suggests that this species is nested within the genus Spizaetus (15 Helbig, A. J., A. Kocum, I. Seibold, and M. J. Braun (2005). A multi-gene phylogeny of aquiline eagles (Aves: Accipitriformes) reveals extensive paraphyly at the genus level. Molecular Phylogenetics and Evolution 35(1):147–164. Close , 16 Lerner, H. R. L., and D. P. Mindell (2005). Phylogeny of eagles, Old World vultures, and other Accipitridae based on nuclear and mitochondrial DNA. Molecular Phylogenetics and Evolution 37:327–346. Close , 17 Haring, E., K. Kvaløy, J.-O. Gjershaug, N. Røv, and A. Gamauf (2007). Convergent evolution and paraphyly of the hawk-eagles of the genus Spizaetus (Aves, Accipitridae) phylogenetic analyses based on mitochondrial markers. Journal of Zoological Systematics and Evolutionary Research 45(4):353-365. Close ).

None reported.

In phylogenetic studies using both nuclear and mitochondrial DNA sequence data, Black-and-chestnut Eagle has been found to be part of the genus Spizaetus, where it appears to be sister to Ornate Hawk-Eagle (Spizaetus ornatus). Together, these two species appear to be sister to Black-and-white Hawk-Eagle (Spizaetus melanoleucus), with Black Hawk-Eagle (Spizaetus tyrannus) sister to the entire group (15 Helbig, A. J., A. Kocum, I. Seibold, and M. J. Braun (2005). A multi-gene phylogeny of aquiline eagles (Aves: Accipitriformes) reveals extensive paraphyly at the genus level. Molecular Phylogenetics and Evolution 35(1):147–164. Close , 16 Lerner, H. R. L., and D. P. Mindell (2005). Phylogeny of eagles, Old World vultures, and other Accipitridae based on nuclear and mitochondrial DNA. Molecular Phylogenetics and Evolution 37:327–346. Close , 17 Haring, E., K. Kvaløy, J.-O. Gjershaug, N. Røv, and A. Gamauf (2007). Convergent evolution and paraphyly of the hawk-eagles of the genus Spizaetus (Aves, Accipitridae) phylogenetic analyses based on mitochondrial markers. Journal of Zoological Systematics and Evolutionary Research 45(4):353-365. Close ). The genus Spizaetus previously also included the Old World hawk-eagles, but genetic data shows that these two groups are paraphyletic. The exact relationships of the Old World hawk-eagles are not clear, but they may be most closely related to Black Eagle (Ictinaetus malaiensis), or to the entire radiation of aquiline eagles, which includes Aquila, Hieraaetus, Clanga, and Spizaetus, among others; the Old World hawk-eagles have subsequently been classified in a new genus, Nisaetus (17 Haring, E., K. Kvaløy, J.-O. Gjershaug, N. Røv, and A. Gamauf (2007). Convergent evolution and paraphyly of the hawk-eagles of the genus Spizaetus (Aves, Accipitridae) phylogenetic analyses based on mitochondrial markers. Journal of Zoological Systematics and Evolutionary Research 45(4):353-365. Close ).

The genus Spizaetus comes from the Greek Spizias for "hawk" and Aëtos for "eagle". Vieillot (18 Vieillot, L. J. P. (1816). Analyse d'une nouvelle ornithologie elementaire. France: Paris. Close ) described the genus as follows: “Spizaëtus are birds of prey that we call eagles, according to their size, but they differ from true eagles in that they have wings and legs of a hawk or goshawk, that is, wings shorter than the tail, tall and thin tarsi and weak fingers, from there comes the name of goshawk-eagles or hawk-eagles.” The specific epithet isidori honors Professor Isidore Geoffroy-Saint-Hilaire; Des Murs (11 Des Murs, M. O. (1845). Description de quelques espèces nouvelles d'Oiseaux. Revue Zoologiqe 1845:175-179 Close ), in their original description of the species, wrote “we have dedicated, as a tribute of our respect, to Professor Isidore Geoffroy-Saint-Hilaire...” (19 Mouchard, A. (2019). Etimología de los nombres científicos de las aves de Argentina: su significado y origen. Primera Edición. Fundación de Historia Natural Félix de Azara, Buenos Aires, Argentina. Close ). The common name in English is derived from its general black-and-chestnut coloration. The common names in Spanish are varied and depend on the region and country, for instance: "Águila crestada," "Águila real," or "Guamán" (in Colombia), "Águila andina," "Gavilán cachudo," or "Ugabanga" (in Ecuador), "Águila inca," "Monero," or "Anca" (in Peru), and "Águila poma" (in Argentina). In southern Colombia and northern Ecuador it is also called "Cigüeña" (Stork).

Information needed.