This species ranges only from the eastern lowlands of southeastern Darien Province, Panama, through the Pacific lowlands of Colombia to extreme northwestern Ecuador. It has also been reported from Gorgona Island, Colombia (Dunn, 1942; Urbina-C. and Londoño-M., 2003). It is known to occur up to 923m asl.
Habitat and Ecology
It is a subterranean species, also living in the moist leaf-litter, in humid tropical lowland and foothill forests. It is not known whether or not it can survive in degraded, open areas. There is no information on its breeding habitats.
It is a common species in Colombia, but is rare in Ecuador. There is no information from Panama, where it is known only from a single locality.
Deforestation as a result of expanding agriculture is a potential threat, but there is not enough information to confirm this.
It occurs in several protected areas in Colombia, and is known from Parque Nacional Darien in Panama.
This is a poorly circumscribed species in need of taxonomic review (M. Wilkinson pers. comm.).
John Lynch, Juan Manuel Renjifo, Diego Cisneros-Heredia, Frank Solís, Roberto Ibáñez, César Jaramillo, Querube Fuenmayor, Mark Wilkinson, Marvalee Wake 2010. Caecilia nigricans. In: IUCN 2014