Reference

Jorge H. Valencia, George Vaca-Guerrero, Katty Garzon (2011): Natural history, potential distribution and conservation status of the Manabi Hognose Pitviper Porthidium arcosae (SCHÄTTI & KRAMER, 1993), in Ecuador (Squamata: Viperidae: Crotalinae). – Herpetozoa – 23_3_4: 31 - 43.