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Shells of two different species of sea snail: on the left is the normally sinistral (left-handed) shell of Neptunea angulata, on the right is the norm
Shells of two different species of sea snail: on the left is the normally sinistral (left-handed) shell of Neptunea angulata, on the right is the normally dextral (right-handed) shell of Neptunea despecta
The shell of a large land snail (probably Helix pomatia) with parts broken off to show the interior structure. 1 – umbilicus 2 – columellar plait 3 –
The shell of a large land snail (probably Helix pomatia) with parts broken off to show the interior structure. 1 – umbilicus 2 – columellar plait 3 – aperture 4 – columella 5 – suture 6 – body whorl 7 – apex
Four views of a shell of Arianta arbustorum: Apertural view (top left), lateral view (top right), apical view (bottom left), and umbilical view (botto
Four views of a shell of Arianta arbustorum: Apertural view (top left), lateral view (top right), apical view (bottom left), and umbilical view (bottom right).
The left-handed turrid (Antiplanes vinosa)
The left-handed turrid (Antiplanes vinosa)
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Gastropoda
Gastropoda
Cepaea nemoralis: a European pulmonate land snail, which has been introduced to many other countries
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 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,
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.