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A snail is a mollusc of the class gastopoda. Snails are extraordinarily diverse but all have coiled shells as adults to protect them and a strong foot coated in mucous for locomotion. All land snails are hermaphrodites and have two sets of tentacles which carry the eyes and olfactory organs. Articles this image appears in Snail Creator Al2
The jaw is opposite to the radula and reinforces part of the foregut. [2] The more purely carnivorous the diet, the more the jaw is reduced. [2] There are often pieces of food in the gut corresponding to the shape of the jaw. [2] The jaw structure can be ribbed or smooth:
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A diagram showing a split-sectioned drawing of a snail, with numbers from 1 to 24 pointing to different organs of the mollusc. Items portrayed in this file depicts
The columella (meaning "little column") or (in older texts) pillar is a central anatomical feature of a coiled snail shell, a gastropod shell. The columella is often only clearly visible as a structure when the shell is broken, sliced in half vertically, or viewed as an X-ray image.
The top snails are characterized by some primitive traits: a heart with two atria. They have retained only one kidney and the second osphradium has been lost in the course of evolution. The mantle cavity contains a single gill. Along the side of the foot are three or more pairs of sensory epipodial tentacles. The head has a short, broad rostrum.
The rest of the body of the snail is shown in green. The food is shown in blue. Muscles that control the radula are shown in brown. The surface of the radula ribbon, with numerous teeth, is shown as a zig-zag line. The odontophore is part of the feeding mechanism in molluscs.
In opisthobranch marine gastropods, the chemosensory organs are two protruding structures on top of the head. These are known as rhinophores . An opisthobranch sea slug Navanax inermis has chemoreceptors on the sides of its mouth to track mucopolysaccharides in the slime trails of prey, and of potential mates.