Kawashita-Ribeiro, R.A. et al. 2012. Morphology and geographical distribution of the poorly known snake Umbrivaga pygmaea (Serpentes: Dipsadidae) in Brazil. Phyllomedusa: Journal of Herpetology. 10, 2 (Oct. 2012), 177–182. DOI:https://doi.org/10.11606/issn.2316-9079.v10i2p177-182.