parivincular ligament

mollusk anatomy

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July 1, 2026

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The parivincular ligament is a feature of bivalve mollusk anatomy. Bivalves are marine and freshwater animals that possess a shell composed of two hinged parts, or valves. The ligament, secreted by the mantle, is located middorsally and creates the opening thrust that opposes the closing action of the adductor muscles. This ligament typically develops externally and comprises outer lamellar and inner fibrous layers. The hinge plate, along with the ligament, also features interlocking teeth that ensure proper valve alignment. The mantle itself is a soft covering that secretes the shell and forms a mantle cavity.12

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bivalve
The shell
…typically develops either externally (parivincular) or internally (alivincular) but comprises outer lamellar, and inner fibrous, layers secreted by the mantle crest. The ligament type is generally characteristic of each bivalve group. The hinge plate with ligament also possesses interlocking teeth to enforce valve alignment and locking, when closed, to…
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…typically develops either externally (parivincular) or internally (alivincular) but comprises outer lamellar, and inner fibrous, layers secreted by the mantle crest. The ligament type is generally characteristic of each bivalve group. The hinge plate with ligament also possesses interlocking teeth to enforce valve alignment and locking, when closed, to…
Read More