Onejaws are deep sea venomous snakes

Deep sea fish have developed a long series of different adjustments to make sure that once found, the prey cannot escape. The onejaw solution is unique, as the eel-like fish has developed into a deep sea venomous snake. Though the about 10- cm-long onejaws only have teeth in their lower jaws, they have no problems killing their prey. At the top of the mouth, there is a large fang, which is an outgrowth of the skull and linked with two poison glands.