False Limpet, also known as Star Limpet or Scurria
Phylum: Mollusca, Class: Gastropoda, Order: Patellogastropoda, Family: Lottiidae, Genus: Scurria, Species: Scurria scurra · Lottiidae (True Limpet and False Limpet family) · Gastropod univalve, whole shell, conical cap-shaped form
Species
Scurria scurra
Shell Type
Gastropod univalve, whole shell, conical cap-shaped form
Family
Lottiidae (True Limpet and False Limpet family)
Size
Approximately 1 inch in length, which is typical for a mature specimen of this species; adults generally range from 0.75 to 1.5 inches.
Color & Pattern
Whitish to pale grey base color overlaid with radial ribs showing faint brownish or reddish-pink speckling, especially concentrated near the elevated apex. The exterior shows natural wear with some sun-bleached patches, while the interior is smooth and pearly white.
Rarity
Common within its native geographic range, though considered a regional specialty outside of South American waters.
Habitat
Marine intertidal and shallow subtidal zones, typically attached tightly to rocky substrates and boulders where they graze on algae in high-energy wave environments.
Geographic Range
Temperate waters of the southeastern Pacific Ocean, commonly found along the coast of Chile and Peru.
Description
A charming, compact conical shell featuring prominent, radiating ribs extending from an elevated, slightly off-center apex down to a scalloped margin. The exterior texture is rough due to the strong radial ridges, while the interior is glossy and smooth, designed to create a strong suction seal against rocks.
Key Features
Conical cap-shape without a visible spiral coil in the adult stage, prominent elevated apex, and strong radial ribs radiating outward to a denticulated margin.
Collector Value
Modest collector value. These are widely appreciated by regional shell enthusiasts and educational displays, typically valued at a few dollars unless part of a specialized limpet collection.
Condition Notes
Good condition with minor weathering and sun-bleaching on the apex. The margins are intact, and the structural integrity is solid, placing it in the Fine collectibility grade.
Interesting Facts
Limpet shells are renowned for their incredible suction power, allowing them to withstand crashing waves. Their teeth are made of goethite, one of the strongest biological materials known to science, harder than copper and capable of scraping rock.
Ecological Role
Limpets serve as crucial primary consumers in rocky shore ecosystems, grazing on microalgae and diatoms to prevent algal overgrowth and maintaining open spaces for other sessile marine organisms.
Similar Species
True limpets of the family Patellidae, which can be distinguished by microscopic radula and internal muscle scar differences, as well as various keyhole limpets that feature an apical aperture.
Beach Finding Tips
Search rocky intertidal zones during extreme low tides, inspecting the bases of boulders and tidal pools where wave action is moderately high.