SPECIES LIMITS OF THE LEAST PYGMY-OWL (GLAUCIDIUM MINUTISSIMUM) COMPLEX

摘要

The Least Pygmy-Owl (Glaucidium minutissimum) complex comprises 10 described taxa that inhabit tropical and subtropical forests. Consistent song differences among taxa in this complex, supported by morphometric, plumage, and habitat data, indicate that, in addition to the recently described G. hardyi and G. parkeri, four species can be recognized in the Least Pygmy-Owl complex: G. palmarum of western Mexico (includes the described subspecies palmarum, oberholseri, and griscomi); G. sanchezi of northeastern Mexico; G. griseiceps of southeastern Mexico, Central America, and the Pacific slope of northern South America (includes the described subspecies griseiceps, rarum, and occul-tum); and G. minutissimum of southeastern Brazil and adjacent Paraguay.