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Histioteuthis NOAA.jpg
Histioteuthis sp.
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Coleoidea
Order: Teuthida
Suborder: Oegopsina
Family: Histioteuthidae
Verrill, 1881
Genus: Histioteuthis
Orbigny, 1841

17 species and subspecies, see text

Histioteuthis is a genus of squid and the only member of the Histioteuthidae family. 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.[1]



  1. ^ Mismatched Eyes Help Squid Survive Ocean’s Twilight Zone, at Duke University; by Kara Manke; published February 13, 2017; retrieved June 25, 2017

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