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:
“No prayers or incense rose up in those hours
Which grew to be years, and every day came mute
Ghosts from the ovens, sitting through crisp air,
And settled upon his eyes in a black soot.”
—Anthony Hecht (b. 1923)
“What our eyes behold may well be the text of life but one’s meditations on the text and the disclosures of these meditations are no less a part of the structure of reality.”
—Wallace Stevens (1879–1955)
“Your eyes have pardoned our faults,
your hands have touched us
you have leaned forward a little
and the waves can never thrust us back
from the splendour of your ragged coast.”
—Hilda Doolittle (1886–1961)