Schories, S., 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, Oct. 2009, pp. 35–50, doi:10.11646/zootaxa.2266.1.2.