<P> The freshwater snail Bithynia tentaculata is capable of detecting the presence of molluscivorous (mollusk - eating) leeches through chemoreception, and of closing its operculum to avoid predation . </P> <P> The deepwater snail Bathynerita naticoidea can detect mussel beds containing the mussel Bathymodiolus childressi, because it is attracted to water that has cues in it from this species of mussel . </P> <P> Some terrestrial gastropods can track the odor of food using their tentacles (tropotaxis) and the wind (anemotaxis). </P> <P> 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 . </P>

Where are snails eyes located on their body