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DOAN, T.M., MASON, A.J., CASTOE, T.A., SASA, M. and PARKINSON, C.L. 2016. A cryptic palm-pitviper species (Squamata: Viperidae: <em>Bothriechis</em>) from the Costa Rican highlands, with notes on the variation within B. nigroviridis . Zootaxa. 4138, 2 (Jul. 2016), 271–290. DOI:https://doi.org/10.11646/zootaxa.4138.2.3.