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univalve shellclick to hear

Land or aquatic mollusk having a foot and head, which retract into a spiral shell made of a single piece.
univalve shell morphology of a univalve shell spiral rib whorl siphonal canal inner lip columella fold axial rib outer lip aperture suture columella nuclear whorl apex

morphology of a univalve shell click to hear

spiral rib click to hear

Protruding line on the whorl of the shell parallel to the suture line.

whorl click to hear

Each of the turns around the apex, except the last; its diameter grows.

siphonal canal click to hear

Tubular extension of the opening of the last complete turn allowing water to circulate.

inner lip click to hear

Inner wall of the opening made by the last complete turn of the shell, opposite the outer lip.

columella fold click to hear

Small protuberance located along the columella.

axial rib click to hear

Protruding line on the whorl of the shell parallel to the columella.

outer lip click to hear

Outer wall of the opening made by the last complete turn of the shell, opposite the inner lip.

aperture click to hear

Orifice of the last complete turn allowing the head and foot of the mollusk to exit; it also withdraws into its shell through this opening.

suture click to hear

Line marking off the successive whorls of the shell.

columella click to hear

Solid axis of the shell that can be solid or hollow; the whorls turn around it.

nuclear whorl click to hear

First complete turn of the shell formed at the larval stage.

apex click to hear

Crown from which the shell grows.