Species Account

Pandora inaequivalvis (Linnaeus, 1758)

Pandoroidea : Pandoridae

Tebble name: Pandora albida (Röding)
Smith & Heppell name: Pandora inaequivalvis (L., 1758)

To size: To 39mm. Shell Structure: Thin, brittle. Equivalve: Inequivalve. Equilateral: Inequilateral, beaks to anterior. Outline: Boat-shaped; ventral margin very broadly curved, dorsal margin almost straight, slightly concave. Posterior margin raised higher than umbonal area into a spout shape. RV is flat, no beak, the posterior two thirds of ventral margin curved over to cover the dorsal margin of LV. LV is curved and twisted so that the anterior third, including the beak, overlaps and covers the RV. Anterior and posterior gape. Contour: Shell slightly twisted. Two radial ridges on LV posterior dorsal region (spout).

Sculpture: Fine concentric lines. Two radial ridges on LV posterior dorsal region (spout). Margin: Smooth. Ligament: Internal, thin, pale brown, pointing roughly 45° to posterior. Hinge: No hinge-plate, RV has tooth-like projection anterior to the ligament. LV has thickened part of shell anterior to ligament and not quite parallel to dorsal margin. There is a gap in this thickened area for the ligament and then it continues posteriorly two thirds along the posterior dorsal margin. Pallial Musculature: Posterior adductor is set in a way from the posterior margin halfway to the umbonal region. Pallial line with no sinus, but is not continuous - made up of dotted line. Periostracum: Beige to pale-brown. Posterior spout area often accumulates sand particles, giving it a darker appearance. Colour: White.

Distribution & Ecology

Mostly recorded from the English Channel with scattered records in the Irish Sea and valves only from the west of Scotland. In sand and sandy mud from low in the intertidal to moderate shelf depths.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species

Related Species

Pandoroidea : Pandoridae


Listed are literature citing Pandora inaequivalvis (Linnaeus, 1758). Reference containing the species Type Description is highlighted.

Allen J A 1954. On the structure and adaptations of Pandora inaequivalvis and P. pinna. Journal of Microscopical Science. 95: 473-482.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.


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Record last modified: 22/03/2016