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Pulmonate land snails usually have two sets of tentacles on their head: the upper pair have an eye at the end; the lower pair are for olfaction.
Well-developed eye of Eustrombus gigas on eyestalk. There is a small tentacle on the eyestalk also.
This article is about eyes mounted on stalks. For the instinctive tendency to track prey, see eye-stalking

In anatomy, an eyestalk (sometimes spelled as eye stalk or known as an ommatophore) is a protrusion that extends the eye away from the body, giving the eye a better field of view than if it were unextended. It is common in nature and in fiction.

In nature[edit]

In nature, eyestalks are sometimes called tentacles, and may have olfactory organs and/or eyes at the end. Examples include snails, the trilobite superfamily Asaphida, and fly family Diopsidae. The crustacean family Polychelidae have eyestalks but no eye.

In fiction[edit]

A beholder is a fictional character that sports numerous vertical eyestalks.[1]

Many Dalek variants have a horizontal eyestalk.

Grans from Star Wars have eyestalks.

See also[edit]

Eyestalk ablation