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Muricopsinae
Counting gastropod whorls. In this example a shell with 3¾ whorls is shown, with the fourth whorl expanding more rapidly than whorls 1–3.
Counting gastropod whorls. In this example a shell with 3¾ whorls is shown, with the fourth whorl expanding more rapidly than whorls 1–3.
View of the spire side of the planispiral shell of the freshwater snail Anisus septemgyratus. This shell has seven and a half whorls
View of the spire side of the planispiral shell of the freshwater snail Anisus septemgyratus. This shell has seven and a half whorls
A fossil shell of the marine gastropod Turritella communis. This shell has nine whorls
A fossil shell of the marine gastropod Turritella communis. This shell has nine whorls
The shell of the marine gastropod Haliotis asinina has fewer than two whorls
The shell of the marine gastropod Haliotis asinina has fewer than two whorls