Histioteuthis



Histioteuthis is a genus of squid in the family Histioteuthidae. It goes by the common name cock-eyed squid, because in all species the right eye is normal-sized, round, blue and sunken; whereas the left eye is at least twice the diameter of the right eye, tubular, yellow-green, faces upward, and bulges out of the head.

In 2017, researchers at Duke University established that Histioteuthis uses its larger eye to see ambient sunlight, and its smaller eye to detect bioluminescence from prey animals.

The name is composed of the Greek histion (ἱστίον, "sail", a large webbed membrane between six of the arms, in some species) and teuthis ("squid").

The genus contains bioluminescent species.

Species

 * H. bonnellii species-group
 * Histioteuthis bonnellii, umbrella squid
 * Histioteuthis machrohista
 * H. reversa species-group
 * Histioteuthis eltaninae
 * Histioteuthis atlantica
 * Histioteuthis reversa, reverse jewel squid
 * H. celetaria subspecies-group
 * Histioteuthis celetaria celetaria
 * Histioteuthis celetaria pacifica
 * H. corona subspecies-group
 * Histioteuthis corona berryi
 * Histioteuthis corona cerasina
 * Histioteuthis corona corona
 * Histioteuthis corona inermis
 * H. miranda species-group
 * Histioteuthis miranda
 * Histioteuthis oceani
 * H. meleagroteuthis species-group
 * Histioteuthis heteropsis, strawberry squid
 * Histioteuthis meleagroteuthis