Da Costa Prudente, A.L., Da Silva, M.A.A., Da Rocha, W.A. & Franco, F.L. (2008) Morphological variation in Xenoxybelis boulengeri (Procter, 1923) (Serpentes, Xenodontinae, Philodryadini). Zootaxa, 1743 (1), 53–61.
https://doi.org/10.11646/zootaxa.1743.1.5