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:
“I shut my eyes and all the world drops dead;
I lift my eyes and all is born again.”
—Sylvia Plath (1932–1963)
“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)
“My one and noble heart has witnesses
In all love’s countries, that will watch awake;
And when blind sleep falls on the spying senses,
The heart is sensual, though five eyes break.”
—Dylan Thomas (1914–1953)