Eyes
In terrestrial pulmonate gastropods, eye spots are present at the tips of the tentacles in the Stylommatophora or at the base of the tentacles in the Basommatophora. These eye spots range from simple ocelli that cannot project an image (simply distinguishing light and dark), to more complex pit and even lens eyes. Vision is not the most important requirement in terrestrial gastropods, because they are mainly nocturnal animals.
Some gastropods, for example the freshwater Apple snails (family Ampullariidae) and marine species of genus Strombus can completely regenerate their eyes. The gastropods in both of these families have lens eyes.
Morphological sequence of different types of multicellular eyes exemplified by gastropod eyes:
Read more about this topic: Sensory Organs Of Gastropods
Famous quotes containing the word eyes:
“He saw: but blasted with excess of light,
Closed his eyes in endless night.”
—Thomas Gray (1716–1771)
“Nature has her own best mode of doing each thing, and she has somewhere told it plainly, if we will keep our eyes and ears open. If not, she will not be slow in undeceiving us, when we prefer our own way to hers.”
—Ralph Waldo Emerson (1803–1882)
“And then a tall fat man with stringy hair
And a manner that was innocent of sin,
His galluses greasy, his eyes coldly gray,
Appeared, and with a gravely learned air
Spoke from the deep coherence of hell....”
—Allen Tate (1899–1979)