A new endemic karst-associated species of lance-headed pit viper (Squamata, Viperidae, Protobothrops) from Laos by Rupert J. Grassby-Lewis, Peter Brakels, Nathanaël Maury, Saly Sitthivong, David Frohlich, Parinya Pawangkhanant, Sabira S. Idiiatullina, Tan Van Nguyen, Nikolay A. Poyarkov

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