Aquatic snails have two tentacles, terrestrial snails have four tentacles, and their eyes are on the tip (terrestrial snail) or bottom (aquatic snail). Snails rely on the senses of smell, touch, and chemosensory organs to navigate the world. What is their role in life? November 11, 2010
How many eyes do snails have?
Some terrestrial species of snails, like the grape snails in the photo, have only one pair of tentacles, which means they have only one eye. The snail's mouth has what is called the radula. It's like a file in a row of about 25,000 small teeth.
Where are the snail's eyes?
Basomatophoran is a pulmonary or air-breathing aquatic snail, characterized by the eyes being at the base of the tentacle, not the tip of the tentacle, like the true terrestrial snail Stylommatophora.
Are aquatic snails blind?
Snails are almost completely blind and have no mechanism to hear sound. Some kind of sensory deprivation makes their sense of smell extraordinary. They can clearly find food from a few meters away, which is quite a distance for their small sized animals.
Do snails have four hearts?
Snails usually have two ventricles, one atriosphere and one ventricle. Few groups have two atriums, and the heart is a three-chamber atrium. There is a valve between the atrium and the ventricle to prevent blood from flowing back. The snail cycle is basically open.
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