''Histioteuthis'' is a genus of

squid A squid (: squid) is a mollusc with an elongated soft body, large eyes, eight cephalopod limb, arms, and two tentacles in the orders Myopsida, Oegopsida, and Bathyteuthida (though many other molluscs within the broader Neocoleoidea are also ...

in the family Histioteuthidae. It goes by the

common name In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often con ...

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 Duke University is a Private university, private research university in Durham, North Carolina, United States. Founded by Methodists and Quakers in the present-day city of Trinity, North Carolina, Trinity in 1838, the school moved to Durham in 1 ...

established that ''Histioteuthis'' uses its larger eye to see ambient

sunlight Sunlight is the portion of the electromagnetic radiation which is emitted by the Sun (i.e. solar radiation) and received by the Earth, in particular the visible spectrum, visible light perceptible to the human eye as well as invisible infrare ...

, and its smaller eye to detect

bioluminescence Bioluminescence is the emission of light during a chemiluminescence reaction by living organisms. Bioluminescence occurs in multifarious organisms ranging from marine vertebrates and invertebrates, as well as in some Fungus, fungi, microorgani ...

from prey animals.Mismatched Eyes Help Squid Survive Ocean’s Twilight Zone
at

; by Kara Manke; published February 13, 2017; retrieved June 25, 2017 The name is composed of the Greek ' (, "sail", a large webbed membrane between six of the arms, in some species) and ' ("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'' species-group **'' Histioteuthis celetaria'' **'' Histioteuthis pacifica'' *''H. corona'' species-group **'' Histioteuthis berryi'' **'' Histioteuthis cerasina'' **'' Histioteuthis corona'' **'' Histioteuthis inermis'' *''H. miranda'' species-group **'' Histioteuthis miranda'' **'' Histioteuthis oceani'' *''H. meleagroteuthis'' species-group **''

Histioteuthis heteropsis ''Histioteuthis heteropsis'', common name, known as the strawberry squid, is a species of small Histioteuthis, cock-eyed squid. The scientific nomenclature of these squid stems from their set of differently sized eyes, one being small and blue an ...

'', strawberry squid **'' Histioteuthis meleagroteuthis''

References

External links

Histioteuthidae discussion forum at TONMO.com
Histioteuthidae Bioluminescent molluscs {{squid-stub