Bathylychnops exilis

Bathylychnops exilis, the Javelin spookfish, is a deep sea fish that was first discovered by Daniel M. Cohen. B. exilis is a species of barreleye first collected in the North Pacific and in the eastern Atlantic Ocean near the Azores where it is found at depths of around 640 metres (2,100 ft). The species was initially discovered during a U.S. Fish and Wildlife expedition. This species grows to a length of 580mm SL.

The species is notable for the presence of two individual globes per eye socket, each of which has "a well developed lens" and a retina. This has led to the species being called a "four-eyed" fish. They have two primary globes that are dorsally directed and two secondary auxiliary globes that are ventrally directed. It has been suggested that the purpose of these extra globes is the detection of threats from the periphery, since these eyes point downwards. This feature provides great benefits in their chances for survival.