Gibbula capensis
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Gibbula capensis is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Aperture (mollusc)
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The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc.
Three views of a shell of Norelona pyrenaica with the apertural view in the center
A shell of Semicassis pyrum, which has a large aperture and a pronounced parietal callus
Conus betulinus has a long and narrow aperture.
Indrella ampulla has an oval aperture.