Money Cowrie (also known as Monetaria moneta)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Cypraeidae, Genus: Monetaria, Species: Monetaria moneta · Cypraeidae (Cowrie family) · Gastropod (snail/univalve), whole shell, smooth and rounded oval shape with a flattened base
Species
Monetaria moneta
Shell Type
Gastropod (snail/univalve), whole shell, smooth and rounded oval shape with a flattened base
Family
Cypraeidae (Cowrie family)
Size
Approximately 1 inch (25 mm) in length, which is average for this species. Adults typically range from 0.6 to 1.6 inches (15 to 40 mm).
Color & Pattern
Off-white to pale yellowish or greenish-grey base color with indistinct darker banding. The margins and base are white, and the teeth lining the aperture have brownish-orange coloration. The surface is glossy and porcelain-like, typical of healthy cowries.
Rarity
Very Common, frequently found by beachcombers and reef walkers throughout its native range.
Habitat
Found in shallow intertidal and subtidal zones, particularly on coral reefs, under coral rocks, and in tide pools. They prefer shallow, warm tropical marine waters.
Geographic Range
Indo-Pacific region, spanning from the east coast of Africa, through the Indian Ocean, and across the Pacific to Polynesia.
Description
This is a classic Money Cowrie shell, characterized by its asymmetrical, flattened, and thickened margins. The dorsal surface is smooth, highly polished, and humped, while the flattened base features a narrow, toothed aperture running the length of the underside. The teeth are distinct and well-formed along both sides of the opening.
Key Features
Flattened and irregular hexagonal-to-oval shape, thickened margins, a low hump on the dorsum, and strong teeth along both sides of the narrow aperture.
Collector Value
Low to moderate individual value due to its abundance, though it remains a staple for beginner and intermediate shell collectors and educational displays. Typically sold very inexpensively in shell shops.
Condition Notes
Good condition with a natural glossy finish and intact teeth along the aperture. Some minor natural wear and slight bleaching on the dorsal surface, grading this specimen as 'Good' to 'Fine'.
Interesting Facts
Historically, Monetaria moneta was widely used as a form of currency (shell money) throughout parts of Africa, Asia, and the Pacific islands for centuries before the introduction of paper and coin currency.
Ecological Role
Herbivorous grazers that feed primarily on algae growing on coral reefs, helping to maintain reef health by preventing algae overgrowth. They serve as prey for various marine predators including cone snails, octopuses, and reef fish.
Similar Species
Monetaria annulus (Gold-ringer cowrie), which is distinguished by a bright orange-yellow ring on the dorsal surface.
Beach Finding Tips
Look under flat rocks, coral rubble, and in shallow tide pools during extremely low tides in tropical Indo-Pacific destinations.