Histioteuthis ruppelli (now Histioteuthis bonelli) - The Umbrella Squid

The umbrella squid is a member of the genus Histioteuthis, or the cock-eyed squid. This genus is characterized by a right eye similar in size to other squids of the same mass, but a left eye that’s at least twice as large as the right.

The head of the Histeoteuthidae has no tentacle pockets, its club arms often have sharp hooks, and it has no corneal coverings over its eyes. In contrast, the largest family of squid (Loligo) have club tentacles without hooks, and have corneal coverings that allow a sort of “blinking” to take place.

Images:

Die Cephalopoden. Carl Chun, 1910.

Kunstformen der Natur. Ernst Haeckel, 1900.

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