S. Schories, M. K. Meyer, and M. Schartl, “Description of Poecilia (Acanthophacelus) obscura n. sp., (Teleostei: Poeciliidae), a new guppy species from western Trinidad, with remarks on P. wingei and the status of the “Endler’s guppy””, Zootaxa, vol. 2266, no. 1, pp. 35–50, Oct. 2009.