Money Cowrie or Ring Cowrie (Monetaria moneta)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Cypraeidae, Genus: Monetaria, Species: Monetaria moneta · Cypraeidae (Cowrie family) · Gastropod (snail/univalve), whole shell, ovate and rounded shape with a flattened base
Species
Monetaria moneta
Shell Type
Gastropod (snail/univalve), whole shell, ovate and rounded shape with a flattened base
Family
Cypraeidae (Cowrie family)
Size
Approximately 0.8 inches (20 mm), which is typical for this species. Adults generally range from 0.6 to 1.2 inches (15 to 30 mm).
Color & Pattern
Pale yellowish-white to light cream base color with subtle greenish or greyish tinges on the dorsum. The margins and base are white or off-white. The colors are natural but slightly worn, lacking high gloss due to wave tumbling.
Rarity
Very Common, frequently encountered by beachcombers and snorkelers throughout its geographic range.
Habitat
Shallow intertidal and subtidal zones, commonly found under rocks, coral rubble, and within crevices on shallow coral reefs and reef flats.
Geographic Range
Indo-West Pacific region, ranging from the east coast of Africa and the Red Sea across the Indian Ocean to Polynesia and Hawaii.
Description
A small, asymmetrical, and smoothly rounded cowrie shell with a distinctively humped or elevated back. The margins are thickened and rounded, and the base is flat with fine, tooth-like ridges lining both sides of the narrow, elongated aperture.
Key Features
Lumpy, irregular ovate shape, humped dorsum, pale yellowish-white coloration without complex dorsal patterns, and a relatively broad, flattened base with distinct labial and columellar teeth.
Collector Value
Low collector value due to extreme abundance, though historically significant. Typically valued at a few cents to a dollar per specimen.
Condition Notes
Good condition with minor natural wear on the surface gloss from wave action. No major chips or structural fractures. Grade: Good.
Interesting Facts
Historically, Monetaria moneta shells were widely used as a form of currency (shell money) throughout Africa, Asia, and the Pacific islands for centuries before the introduction of metal coins.
Ecological Role
Grazing herbivores that feed primarily on algae growing on coral reefs, helping to control algal growth and maintain reef health.
Similar Species
Monetaria annulus (Ring Cowrie), which features a distinct yellow-orange ring on the dorsal surface, easily separating it from the plain dorsum of Monetaria moneta.
Beach Finding Tips
Search among coral rubble, under flat rocks, and in tide pools at low tide in tropical Indo-Pacific regions. They often wash up in shell drift along sandy beaches near coral reefs.