Species Account

Barnea candida (Linnaeus, 1758)

Pholadoidea : Pholadidae

Tebble name: Barnea candida (Linnaeus)
Smith & Heppell name: Barnea candida (L., 1758)

To size: To 65mm. Shell Structure: Thin, brittle, with irregularly oval protoplax. Equivalve: Equivalve. Equilateral: Inequilateral, beaks close to anterior. Tumidity: Inflated. Outline: Subcylindrical, posterior attenuated, narrowly rounded, gaping slightly; anterior broadly rounded, no pedal gape.

Sculpture: Of widely spaced, thin, co-marginal ridges each with low spines in a radial pattern and as distinct radial riblets on the anterior area, the spines forming a denticulate margin. Margin: Inner margin smooth. Ligament: Ligament small, attached to internal chondrophores. Hinge: Umbonal reflection rising slightly above umbo anteriorly, not septate. Pallial Musculature: Pallial sinus wide, rounded, extending to midline. Apophysis long, narrow. Periostracum: Thin, pale brown. Colour: Shell white.

Distribution & Ecology

A borer into soft substrates such as peat, clay, mudstones, shales and chalk. Intertidal and sublittoral to about 10m. Widespread.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species

Key Features & Similar Species

The only piddock lacking an anterior pedal gape throughout life, only Pholadidea loscombiana may be confused when in the adult the callum develops but this structure is distinct from the early shell.

Related Species


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

Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.


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Record last modified: 22/03/2016