Rhomboidella prideauxi (Leach, 1815)Mytiloidea : Mytilidae
To size: Very small to 4mm. Shell Structure: Robust, opaque. Equivalve: Equivalve. Equilateral: Inequilateral beaks close to the anterior margin. Tumidity: Tumid. Outline: Outline modioliform (rhomboidal – subquadrate); umbos prominent; ventral margin long straight, posterior margin long straight or indented, posterior dorsal (ligament) margin straight about half length of ventral margin. Contour: Dorsal area set off by a low rounded posterior angle
Prodissoconch very large, sculpture distinct from adult shell and forming an apparent smooth area over the umbo; prodissoconch I about 345μm in diameter, weakly dimpled; prodissoconch II about 665μm in diameter with regular concentric bands.
Sculpture: Radial sculpture of up to 50 riblets these the strongest along the median slope and much weaker on the ventral area; concentric sculpture of up to 10 thin lamellar ridges, these fluted at intersections with radial riblets. Margin: Inner margin evenly crenulated. Ligament: Ligament interior situated behind the beaks and extending for half the length of the posterior dorsal margin. Hinge: Hinge plate with an irregularly crenulated swollen area beneath the beaks; ligament margin with up to 15 dysodont teeth. Pallial Musculature: Adductor scars of about equal size. Periostracum: Indistinct. Colour: White.
Distribution & Ecology
A southern species extending into the Channel Islands, SW English Channel and around Cornwall and the Scilly Is.
Predominantly sublittoral to moderate shelf depths. Attached by a byssus, probably nestling on hard or coarse substrates with epifauna.
Continental Shelf (to 200m)
Juveniles & Similar Species
Key Features & Similar Species
Listed are literature citing Rhomboidella prideauxi (Leach, 1815). Reference containing the species Type Description is highlighted.
Davoult D, Dewarumez J M & Glacon R 1992. Nouvelles signalisations d’especes macrobenthiques sur les cotes francaises de la Manche orientale er de la Mer du Nord. II Mollusques. New records of macrobenthic species off the French coasts of west Channel and of the North Sea II. Molluscs. Cahiers de biologie marine. 33(1): 95-100.
Leach W E 1815. Zoological miscellany: being descriptions of new or interesting animals London.
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