The Tentacled Snake (Erpeton tentaculatum) is a completely aquatic and entirely piscivorous (fish eating) snake found in fresh water and brackish environs in SE Asia. As with most aquatic snakes, this species is live bearing (viviparous). They reach a maximum length of 90 cm (35 inches). The tentacles on the front of the snake’s face are able to detect very small motions from nearby fish, thus helping them to find prey in darkened waters. Tentacled snakes are rear-fanged venomous snakes, with a venom that affects small cold blooded prey, and is not considered to be harmful to humans.
Read more about research on Tentacled Snake hunting techniques and anatomy here: http://as.vanderbilt.edu/catanialab/research/tentacled-snakes/