Allobates brunneus (Cope, 1887) (Anura, Aromobatidae): significant distribution extension for a formerly critically endangered species from the Brazilian Cerrado

Abstract

We recorded specimens of A. brunneus in at least 14 localities from four municipalities of Mato Grosso state. The genus Allobates Zimmerman and Zimmerman, 1988 (Aromobatidae) comprises 63 species (Frost, 2024) of cryptically colored leaf-litter anurans (Grant et al., 2006), commonly known as nurse-frogs. They are distributed throughout Central and South America (in the Pacific lowlands of Colombia and Ecuador; north and west in Central America to Nicaragua; Martinique, and Amazonian drainages in Brazil, Bolivia, Peru, Ecuador, Colombia, Venezuela, Guyana, Surinam, and French Guiana; Frost, 2024). Most of the 32 species already recorded in Brazil (Segalla et al., 2021) have Amazonian distributions (Grant et al., 2006), and only two species are distributed in localities along the Cerrado ecorregion: Allobates goianus (Bokermann, 1975) and A. brunneus (Cope, 1887) (Valdujo et al., 2012).