Money Cowrie (Money Shell, Gold-ringed Cowrie)
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 0.75 inches (20 mm) in length. This is average for adult specimens of this species, which typically range from 0.6 to 1.6 inches (15 to 40 mm).
Color & Pattern
Translucent off-white, pale yellowish-green, or grayish base color with a faint yellowish or greenish ring around the margins (hence the alternative name gold-ringed cowrie). The dorsal surface is smooth, porcelain-like, and highly glossy, while the flattened base is pure white.
Rarity
Very Common. This species is abundant throughout its geographic range and frequently washes up on beaches or is found by snorkelers.
Habitat
Found primarily in shallow intertidal and subtidal zones, typically in coral reefs, under rocks, among rubble, and in tide pools at depths ranging from the intertidal zone down to about 20 meters.
Geographic Range
Indo-Pacific region, extending from the eastern coast of Africa and the Red Sea across the Indian Ocean to Polynesia, Hawaii, and the Galapagos Islands.
Description
A classic, smooth, and porcelain-glossy cowrie shell with a distinctly ovate, flattened shape. The dorsal surface is humped and smooth, featuring a pale greenish-yellow hue, while the underside is flat and bright white with thick, well-defined teeth lining both sides of the narrow, oblong aperture.
Key Features
Smooth, glossy porcelain texture; distinct flattened white base; narrow, toothed aperture extending the length of the base; ovate, slightly irregular asymmetrical shape with a yellowish marginal ring.
Collector Value
Low collector value due to extreme abundance, though historically and culturally fascinating. Specimens typically sell for a few cents to a couple of dollars unless exceptionally large or possessing rare color morphs.
Condition Notes
The specimen is a whole, intact adult shell in Fine to Good condition. The gloss remains relatively bright on the dorsum with minor natural wear, and the aperture teeth are distinct and well-preserved.
Interesting Facts
Monetaria moneta has one of the most significant human histories of any seashell. For centuries, it was used extensively as a form of fiat currency (shell money) across large parts of Africa, Asia, and the Pacific islands, traded in the millions through colonial trade networks.
Ecological Role
Monetaria moneta is a grazing herbivore that feeds primarily on microalgae and detritus scraped from rocks and coral surfaces. It plays an important role in controlling algae growth on reefs and serves as prey for larger carnivorous gastropods, fish, and crustaceans.
Similar Species
Monetaria annulus (Gold-ringer Cowrie), which features a more distinct, bright golden-orange ring on a whitish-grey back. Monetaria caputserpentis (Snakehead Cowrie) is darker with a mottled pattern.
Beach Finding Tips
Look in shallow reef flats, under flat coral rocks, inside tide pools at low tide, or sifted through shell drift along tropical Indo-Pacific beaches.