eyestalk
Snail's visual protrusion
An eyestalk is a movable stalk with an eye at its tip, found on crustaceans like crabs, lobsters, and shrimp, as well as on snails and slugs.
The structure allows the animal to move its eyes independently and retract them for protection: The crab's eyestalks swiveled as it scuttled sideways.
Pincer-bearing shellfish
- lobsterLarge marine shellfish
- shrimpSmall edible crustacean
- prawnEdible marine decapod
- crayfishFreshwater pinching crustacean
hermit crab · fiddler crab · mantis shrimp · decapod · carapace · exoskeleton · antenna · molting
Flower-bearing stalk
- retinaLight-sensing tissue layer
- corneaEye's clear outer dome
- lensLight-focusing curved glass
- opticOf the eye
ocular · photoreceptor · ganglion · nerve · tissue · membrane · pigment · socket
Shelled, slow-moving mollusk
- slugNaked terrestrial mollusk
- tentacleFlexible grasping appendage
- land snailShelled terrestrial gastropod
- sea slugShell-less marine gastropod
escargot · nudibranch · mollusk · shell · mucus · slime · retractable · sensory
Visual perception faculty
- perceptionMental interpretation of stimuli
- detectionAct of finding something
- gazeFixed, intent look
- viewWhat's seen from somewhere
observe · watch · scanning · panoramic · peripheral · binocular · 360-degree · awareness
Able to draw inward
- extendableAble to increase length
- protrudingExtending outward noticeably
- swivelingTurning on a fixed point
- rotatingTurning on an axis
pivoting · independent · mobile · flexible · articulated · telescoping · periscopic · directional
crab
Pincer-bearing shellfish
crayfish · hermit crab · fiddler crab · mantis shrimp · decapod · carapace · exoskeleton · antenna · molting · arthropod
peduncle
Flower-bearing stalk
optic · ocular · photoreceptor · ganglion · nerve · tissue · membrane · pigment · socket · base
snail
Shelled, slow-moving mollusk
- slugNaked terrestrial mollusk
- tentacleFlexible grasping appendage
- land snailShelled terrestrial gastropod
sea slug · escargot · nudibranch · mollusk · shell · mucus · slime · retractable · sensory
sight
Visual perception faculty
- perceptionMental interpretation of stimuli
- detectionAct of finding something
- gazeFixed, intent look
view · observe · watch · scanning · panoramic · peripheral · binocular · 360-degree · awareness · spatial orientation
retractable
Able to draw inward
- extendableAble to increase length
- protrudingExtending outward noticeably
- swivelingTurning on a fixed point
rotating · pivoting · independent · mobile · flexible · articulated · telescoping · periscopic · directional · raised
eyestalkeye socket
Cranial cavity for sight organ
orbit · simple eye · ocellus · compound eye