Brown Mussel Snail or similar littorinid/nerite coastal snail
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Littorinidae, Genus: Littorina, Species: Littorina scabra · Littorinidae (Periwinkle family) · Gastropod (snail/univalve), whole shell, spiral shape
Species
Littorina scabra or related Littorinidae species (Confidence: Moderate)
Shell Type
Gastropod (snail/univalve), whole shell, spiral shape
Family
Littorinidae (Periwinkle family)
Size
Approximately 0.5 inches (12-15 mm) in length, which is typical for small periwinkles found in the high intertidal zone.
Color & Pattern
Muted brownish-grey base with darker brown banding or mottling along the body whorl and spire. Colors appear natural but slightly weathered by sun and surf exposure.
Rarity
Common, frequently encountered by beachcombers exploring rocky intertidal areas.
Habitat
Found in the high intertidal zone, clinging to rocks, seawalls, mangrove roots, and wharf pilings where it is regularly splashed by saltwater.
Geographic Range
Indo-Pacific region, including the Hawaiian Islands (Oahu), commonly found along rocky tropical shorelines.
Description
A small, solid, turbinate marine snail shell with a pointed spire and a smooth, rounded body whorl. The surface features fine growth lines, and the aperture is relatively compact with a simple outer lip.
Key Features
Small size, turbinate or conical-ovate shape, short spire, lack of prominent sculptural ribs, and preference for high-intertidal rocky habitats.
Collector Value
Low commercial value, typically collected by casual beachcombers rather than advanced conchologists.
Condition Notes
The shell appears generally intact with minor surface weathering and natural fading, grading as Good collectibility.
Interesting Facts
Littorinid snails are remarkably resilient, capable of surviving out of water for extended periods by sealing their aperture against dry surfaces to retain moisture.
Ecological Role
Grazing herbivores that feed on microalgae and biofilms on rocks, helping to control algal growth and serving as a food source for coastal birds and crabs.
Similar Species
Other periwinkle species within the family Littorinidae, distinguished primarily by microscopic radular differences, subtle color variations, and precise microhabitat.
Beach Finding Tips
Look along rocky shorelines, jetties, or concrete sea walls during low tide, particularly in crevices and splash zones.
Notes
Oahu