Centrolene callistommum is known from tributaries of the Río Bogotá (1 05' 13.8" N, 78 41' 25.8" W, 83 masl; 1 05' 9.06" N, 78 41' 8.7" W, 77 masl), Province of Esmeraldas, and from the Río La Carolina (0 42' 16.16" N, 78 12' 4.14" W, 500 m), on the Ibarra–Lita Road, near Jijón y Caamaño, Province of Carchi, Ecuador (Guayasamin and Trueb, 2007).
Habitat and Ecology
The species inhabits the Evergreen Lowland Forests in northwestern Ecuador. It is active during the night and has been found on leaves along streams. Males call from the upper sides of leaves, and females deposit pigmented eggs on the upper sides of leaves (Guayasamin and Trueb, 2007). The species requires permanent streams for breeding (J.M. Guayasamin, pers. comm. 2008).
The species is locally abundant at the localities where it has been found (J.M. Guayasamin, pers. comm. 2008).
Habitat destruction is a major threat for this species (and others that inhabit the Chocoan Ecoregion). It may be restricted to the Chocoan Ecoregion (J.M. Guayasamin, pers. comm. 2008).
No conservation measures are known for this species.
Centrolene callistommum differs from congenerics by a combination of colour patterns and morphological features (Guayasamin and Trueb, 2007).
Juan Manuel Guayasamin 2008. Espadarana callistomma. In: IUCN 2014