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:
“Where words are restrained, the eyes often talk a great deal.”
—Samuel Richardson (1689–1761)
“As I pass down the corridor
past desperate faces at each cell,
your eyes and my eyes may meet.
You will be dark, unkempt,
but I pray for one glimpse of your face
why do I want this?”
—Hilda Doolittle (1886–1961)
“The Anglican Church is marked by the grace and good sense of its forms, by the manly grace of its clergy. The gospel it preaches is, “By taste are ye saved.” ... It is not in ordinary a persecuting church; it is not inquisitorial, not even inquisitive, is perfectly well bred and can shut its eyes on all proper occasions. If you let it alone, it will let you alone. But its instinct is hostile to all change in politics, literature, or social arts.”
—Ralph Waldo Emerson (1803–1882)