Orange Cowrie or Pustulose Cowrie (alternate: Bean Cowrie)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Triviidae, Genus: Niveria, Species: Niveria nucleus · Triviidae (Trivia and Bean Cowrie family) · Gastropod (univalve), whole shell, inflated oval to subglobular shape with a flattened base
Species
Niveria nucleus
Shell Type
Gastropod (univalve), whole shell, inflated oval to subglobular shape with a flattened base
Family
Triviidae (Trivia and Bean Cowrie family)
Size
Approximately 0.4 to 0.5 inches in length, which is average for this species. Adults typically range from 8 to 15 mm (0.3 to 0.6 inches).
Color & Pattern
Solid peach to light orange coloration overall, featuring distinct transverse ribs that cross the dorsum with tiny, subtle pustules or granules along the ridges. The color appears natural and vibrant with no significant sun-bleaching.
Rarity
Uncommon, requiring dedicated searching among coral rubble and under rocks, though well-known to dedicated shell collectors.
Habitat
Found in shallow subtidal waters to moderately deep reefs, typically living under rocks, coral rubble, and in crevices. They are strictly marine organisms.
Geographic Range
Indo-Pacific region, including the Red Sea, East Africa, tropical Indian Ocean, and across to Southeast Asia, Indonesia, and northern Australia.
Description
This charming little shell exhibits an inflated, oval profile with a deeply impressed dorsal sulcus (furrow) running along its length. The entire dorsal surface is crossed by fine, continuous transverse ribs studded with minute pustules. The ventral side features a narrow aperture with fine teeth lining both the outer and inner lips.
Key Features
Distinguished by its small size, oval shape, prominent transverse ribs crossing the back, and the characteristic central furrow (dorsal sulcus) running lengthwise across the dorsum.
Collector Value
Moderately collectible among micro-shell enthusiasts and those focusing on Triviidae. Generally valued between $1 to $5 depending on locality data and pristine condition.
Condition Notes
Good to Fine condition. The shell is intact with rich coloration, well-defined ribs, and no major chips or structural damage, making it a pleasant collector specimen.
Interesting Facts
Despite their common name 'cowries', triviids are actually more closely related to worm snails and false limpets than true cowries (Cypraeidae), though they share a glossy appearance and lack of visible spire.
Ecological Role
These tiny snails are specialized predators that feed exclusively on colonial ascidians (sea squirts). They play a micro-predatory role in reef ecosystems and are preyed upon by small reef fish and carnivorous mollusks.
Similar Species
Other species within the Triviidae family such as Niveria pulla or Trivia arctica, which can be distinguished by differences in the dorsal furrow, rib density, and base coloration.
Beach Finding Tips
Finding these alive or in good condition usually requires carefully turning over coral rubble and flat rocks during extreme low tides, or sifting through shell drift in tropical reef environments.