Species Account

Barnea parva (Pennant, 1777)

Pholadoidea : Pholadidae

Tebble name: Barnea parva (Pennant)
Smith & Heppell name: Barnea parva (Pennant, 1777)

To size: To 40mm. Shell Structure: Solid, with irregulary lanceolate protoplax. Equivalve: Equivalve. Equilateral: Inequilateral, beaks in front of midline. Tumidity: Inflated. Outline: Subelliptical, posterior slightly extended, rounded; anterior beaked with a prominent pedal gape.

Sculpture: Of thin co-marginal raised ridges and closely spaced radial riblets, low spines forming at the intersections; strongest over the anterior. Spines forming denticulate margin around pedal gape. Margin: Inner margin smooth. Ligament: Ligament small, attached to internal chondrophores. Hinge: Umbonal reflection rising above the umbo and extending along the anterior dorsal margin. Pallial Musculature: Pallial sinus deep extending to line of the beaks; ventral adductor scar prominent. Apophysis long, flat, broad. Periostracum: Periostracum thin, straw coloured. Colour: Shell white.

Distribution & Ecology

A borer into soft rocks including chalk, red sandstone and cement stone. Intertidal and sublittoral. A southern species restricted to the English Channel and the south western coasts.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species

Key Features & Similar Species

May be confused with small Pholas dactylus but less elongate and that species has three accessory plates and the umbonal reflection is septate.

Related Species


Listed are literature citing Barnea parva (Pennant, 1777). Reference containing the species Type Description is highlighted.

Pennant T 1777. British Zoology vol.IV. Crustacea, Mollusca, Testacea London, B. White. 154pp, 93pls.


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Record last modified: 22/03/2016