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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 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.
Shell of marine snail Lunella torquata with the calcareous operculum in place Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place. An operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also ...
Cerion snail shells collected on Andros Island, Bahamas. Note variation in morphology from ridged to smooth, color in degree of stripedness, and length to width ratio. Scale at bottom is in centimeters. Cerion is one of the most morphologically diverse genera among land snails.
Shell: Snail shells are mainly composed of a mixture of proteins called conchin, and calcium carbonate. Conchin is the main component in the outer layer of the shell, known as the periostracum . The inner layers of the shell are composed of a network of calcium carbonate, conchin, and different mineral salts.
Apertural view of the shell of adult Tarebia granifera showing its pale brown body whorl and dark spire. Very high-spired shells of the sea snail species Turritella communis Medium-spired shell (live individual) of a European land snail, probably Trochulus hispidus Very low-spired shells of the land snail species Xerolenta obvia The sinistral shell of the freshwater snail Planorbarius corneus ...
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 columella runs from the apex of the shell to the midpoint of the undersurface of the shell, or the tip of the siphonal canal in those shells which have a siphonal canal. If a snail shell is visualized ...
Born right smack on the cusp of millennial and Gen Z years (ahem, 1996), I grew up both enjoying the wonders of a digital-free world—collecting snail shells in my pocket and scraping knees on my ...
Apertural view of the shell of adult Tarebia granifera showing its pale brown body whorl and dark spire. View of the spire side of the planispiral shell of the freshwater snail Anisus septemgyratus. The body whorl is the outermost complete revolution of the shell spiral Three shells of the sea snail species Turritella communis.