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morphology of a bivalve shell click to hear : morphology of a bivalve shell

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See morphology of a bivalve shell in : french | spanish
valve posterior end growth line escutcheon ligament umbo lunule anterior end

valve click to hear : valve

Each of the two parts of a bivalve shell, joined by a ligament.

posterior end click to hear : posterior end

Rear terminal end of the shell, opposite the anterior lip, through which water enters and exits.

growth line click to hear : growth line

Small irregular protuberance on the valves of the shell indicating the stages of growth.

escutcheon click to hear : escutcheon

Dorsal depression of the two valves behind the umbones, through which the ligament extends; its surface is smooth, unlike the rest of the shell.

ligament click to hear : ligament

Corneous structure located behind the umbones and joining both valves of the shell; its elasticity allows them to pull apart.

umbo click to hear : umbo

Protuberance at the terminal end of the valve, from which the shell grows.

lunule click to hear : lunule

Dorsal depression of the two valves in front of the umbones; its surface is smooth, unlike the rest of the shell.

anterior end click to hear : anterior end

Front terminal end of the shell located opposite the posterior lip; it allows the foot to exit.