The taxonomic and conservation status of the Oxypogon helmetcrests Taxonomia y estado de conservacion de Oxypogon guerinii Nigel J. Collar1 & Paul Salaman2 1BirdLife International, Girton Road, Cambridge CB3 0NA; and Bird Group, Department of Life Sciences, Natural History Museum, Akeman St, Tring, Herts HP23 6AP, UK. Email:
[email protected] 2Rainforest Trust, 25 Horner Street, Warrenton VA 20186, USA. Email:
[email protected] Abstract Bearded Helmetcrest Oxypogon guerinii is a hummingbird Morphological variation in the genus Oxypogon was studied comprising four taxonomically distinct populations, named using biometrics and plumage data, and available sound as follows: cyanolaemus in the Sierra Nevada de Santa recordings were inspected. Four distinct populations of Marta (Colombia), lindenii in the Venezuelan Andes, Bearded Helmetcrest Oxypogon guerinii (cyanolaemus in guerinii in the East Andes of Colombia south to the Sierra Nevada de Santa Marta, lindenii in the Cundinamarca, and stubelii (spelling here in accordance Venezuelan Andes, guerinii in the East Andes of Colombia, with Dickinson & Remsen 2013) in the Central Andes of and stubelii in the Central Andes of Colombia) were lumped Colombia. These four taxa were originally described as without justification in the 1940s but are highly distinct in separate species by Boissonneau (1840: guerinii), Parzudaki multiple plumage and morphometric characters. Species (1845: lindenii), Salvin & Godman (1880: cyanolaemus) and rank is suggested for all four taxa, following species scoring Meyer (1884: stubelii). Species rank for all recognised taxa tests. We draw special attention to O. cyanolaemus of the was afforded by the early pioneers of hummingbird Sierra Nevada de Santa Marta, which has not been reported taxonomy, such as Gould (1887), Boucard (1896) and since 1946.