known snakes Monitor lizards uromastyx frilled lizards beardedragons chamaeleonidae Agamas shield tailed snakes freshwater fish The elusive Mangshan viper Trimeresurus mangshanensis Trimeresurus mangshanensis is a venomous pitviper species endemic to Hunan province in China . This species is classified as vulnerable (VU) on the IUCN Red List for the following criteria: