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univalve shell click to hear : univalve shell

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

spiral rib click to hear : spiral rib

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

whorl click to hear : whorl

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

siphonal canal click to hear : siphonal canal

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

inner lip click to hear : inner lip

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

columella fold click to hear : columella fold

Small protuberance located along the columella.

axial rib click to hear : axial rib

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

outer lip click to hear : outer lip

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

aperture click to hear : aperture

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 : suture

Line marking off the successive whorls of the shell.

columella click to hear : columella

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

nuclear whorl click to hear : nuclear whorl

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

apex click to hear : apex

Crown from which the shell grows.