Hiatella rugosa (Linnaeus, 1767)Hiatelloidea : Hiatellidae
To size: To 40mm. Shell Structure: Robust, chalky. Equivalve: Equivalve. Equilateral: Inequilateral, beaks close to the anterior. Outline: Subcylindrical, anterior greatly reduced; anterior dorsal margin short, mostly continuous with rounded anterior; ventral margin long, almost straight; ligament margin slightly inclined then slightly angled with remainder of long posterior dorsal margin; posterior not greatly expanded, subtruncate. Posterior area set off by a low umbonal posterior ventral margin ridge.
Sculpture: Of irregular concentric ridges and lines. Margin: Inner margin smooth. Ligament: External, sunken, becoming relatively extensive extending to 1/3 of length of posterior dorsal margin. Hinge: Hinge teeth usually worn but RV with a single peg-like cardinal; LV with two similar cardinals. Pallial Musculature: Adductor scars unequal, posterior slightly the larger; pallial line fragmented, pallial sinus deep. Periostracum: Persistent over posterior, straw to pale brown coloured. Colour: Shell white.
Distribution & Ecology
A borer into rocks, including hard limestones. Distribution difficult to ascertain due to confusion witth H. arctica but probably widespread and probably restricted to low intertidal and sublittoral depths.
Continental Shelf (to 200m)
Juveniles & Similar Species
Key Features & Similar Species
Differs from H. arctica by its cylindirical rather than wedge shape, lack of spines on the radial ribs (even on the smallest of shells) and the boring habit.
Listed are literature citing Hiatella rugosa (Linnaeus, 1767). Reference containing the species Type Description is highlighted.
Linnaeus C 1767. Systema Naturae. Editio duodecima. 1. Regnum Animale. 1&2 Homliae, Laurentii Salvii. 1-532: 533-1327.
Russell Hunter W. 1949. The structure and behaviour of “Hiatella gallicana” (Lamarck) and “H. arctica” (L.) with special reference to the bring habit. Proceedings of the Royal Society of Edinburgh. LXIII Part III (No. 19): 271-289.
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