Limpetlike shell, small, solid, flattened, low conical. Sculpture of strong, unequal radial ribs projecting on the edge; a stronger rib corresponds to an internal furrow on the right edge.
inside brownish, beige and cream.
common size :
25 mm (max.).
This must not be confused with the true limpets (genus Patella) which lack the inner furrow (and interruption of the muscle scar) on the right side, and are not even closely related. The native Eastern Atlantic species Siphonaria pectinata (Linné, 1758) is found in the warmer parts of the Western Mediterranean, Alboran Sea and Algeria; it is distinguished by its sculpture of fine ribs, of light color contrasting with the intervals, and nearly black color inside.
BIOLOGY / ECOLOGY
Direct larval development (Thorson, 1940). Members of the family are pulmonates, which means that their pallial cavity functions as a lung and that they breathe air. Species of Siphonaria cling tightly to the rock when it is dry, and move around to feed on algae and detritus when the surface is wet from splashing waves or high tide.
high intertidal, on or under rocks. Living specimens of Siphonaria crenata were found above the water line fastened to rocks lying dry (Barash and Danin, 1992).