Aperture (mollusc)
Videos
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.
Plait (gastropod)
Videos
A plait is an anatomical feature which is present on the shells of some snails, or gastropods. This sculpture occurs often in the shells of marine gastropod mollusks in the clade Neogastropoda, but it
The aperture of the shell of Alcithoe swainsoni shows five plaits on the columella, four strong and one weak
