Hairy Limpet, also known as Star Limpet
Phylum: Mollusca, Class: Gastropoda, Order: Patellogastropoda, Family: Nacellidae, Genus: Scutellastra, Species: Scutellastra flexuosa · Nacellidae (True Limpet family) · Gastropod (univalve), whole shell, cap-shaped or conical shape
Species
Scutellastra flexuosa
Shell Type
Gastropod (univalve), whole shell, cap-shaped or conical shape
Family
Nacellidae (True Limpet family)
Size
Approximately 1 to 1.5 inches in diameter, which is typical for adult specimens of this species. Adults generally range from 0.8 to 2 inches.
Color & Pattern
The exterior features a pale greenish-grey central apex with radiating ribs that transition into a rich brownish coloration toward the margin. The margin is heavily fringed by a dense, prominent, hairy periostracum.
Rarity
Common, frequently found in its specific rocky intertidal habitat, though specimens with intact, pristine periostracum like this are especially prized by collectors.
Habitat
Found in the intertidal zone, clinging tightly to rocky substrates, basalt benches, and wave-swept shores where it experiences strong tidal action and surf.
Geographic Range
Indo-Pacific region, including Hawaii, where it is commonly found along rocky coastlines and exposed reefs.
Description
An exquisite, conical limpet shell characterized by numerous strong, radiating ribs that create a scalloped or star-like margin. The most striking feature is the thick, velvety fringe of brown periostracum extending all along the outer edge, giving it a hairy appearance.
Key Features
Conical cap shape, strong radiating ribs, subcentral apex, and a prominent, dense fringe of brownish periostracum bordering the shell edge.
Collector Value
Moderately low commercial value due to commonality, but highly desirable for regional shell collectors who value pristine specimens with intact periostracum.
Condition Notes
Gem condition. The shell is fully intact with minimal wear, retaining its natural coloration and an exceptionally well-preserved, lush hairy periostracum fringe along the entire margin.
Interesting Facts
Limpets have an incredibly strong muscular foot that allows them to clamp down tightly onto rocks to prevent dislodgement by heavy waves and desiccation during low tide. They typically return to a specific 'home scar' on the rock surface.
Ecological Role
Limpets are vital marine herbivores that graze on microalgae and biofilm from rock surfaces, helping to control algal growth and maintain the balance of intertidal rock pool ecosystems.
Similar Species
Other tropical limpets such as Scutellastra granatina or Cellana species, which generally lack the distinct dense hairy periostracum fringe of S. flexuosa.
Beach Finding Tips
Search rocky intertidal zones, tide pools, and basalt shelves during extremely low tides, particularly on wave-washed shores. Look closely on the sides of rocks where live animals cling.
Notes
Hukilau Beach, Oahu