Siphon (mollusc)
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A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda.
A specimen of a venerid bivalve. The adductor muscles have been cut, the valves are gaping. The internal anatomy is visible, including the paired siphons to the right
The siphon of a large herbivore marine volute, Cymbiola magnifica
The sea snail Nassarius fossatus is a scavenger. Siphon on the left
Engraving of Florida freshwater applesnail Pomacea paludosa; siphon on lower right
Gastropoda
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Gastropods, commonly known as slugs and snails, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda.
Gastropoda
Cepaea nemoralis: a European pulmonate land snail, which has been introduced to many other countries
The shell of Zonitoides nitidus, a small land snail, has dextral coiling, which is typical (but not universal) of gastropod shells.
The upper pair of tentacles on the head of Helix pomatia have eye spots, but the main sensory organs of the snail are sensory receptors for olfaction, situated in the epithelium of the tentacles.