Aperture (mollusc)

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

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.

The term aperture is used for the main opening in gastropod shells, scaphopod shells, and also for Nautilus and ammonite shells.

单词	Apertural
释义	Apertural 英语百科 Aperture (mollusc) 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. The term aperture is used for the main opening in gastropod shells, scaphopod shells, and also for Nautilus and ammonite shells.
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Apertural

Aperture (mollusc)