Egg Cowrie / Ovula ovum
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Ovulidae, Genus: Ovula, Species: Ovula ovum · Ovulidae (False Cowrie family) · Gastropod (univalve), whole smooth oval shell with an in-rolled aperture
Species
Ovula ovum
Shell Type
Gastropod (univalve), whole smooth oval shell with an in-rolled aperture
Family
Ovulidae (False Cowrie family)
Size
Approximately 1.5 to 2 inches, which is typical for this species. Adults generally range from 1 to 3 inches in length.
Color & Pattern
Glossy porcelain-white exterior with a characteristic bright orange-yellow interior rim visible on the aperture edge. The living animal features a black mantle with white spots, but the shell itself is pristine white.
Rarity
Common
Habitat
Found in shallow tropical waters, typically associated with soft corals, sea fans, and gorgonians on coral reefs.
Geographic Range
Indo-West Pacific region, ranging from East Africa across the Indian Ocean to Southeast Asia, Australia, and the western Pacific islands.
Description
A smooth, highly polished egg-shaped shell with a pristine white exterior. The aperture is long and narrow, running the entire length of the underside with inner margins bearing fine denticles. The glossy finish is naturally produced by the mantle of the living snail.
Key Features
Smooth, completely white oval shape resembling a bird's egg, lacking the distinct dorsal patterns of true cowries, combined with a long narrow aperture.
Collector Value
Moderately popular among shell collectors as a staple representative of the Ovulidae family. Generally inexpensive and widely available in shell shops.
Condition Notes
Gem condition, exhibiting high natural gloss with no visible chips, cracks, or significant wear.
Interesting Facts
Unlike true cowries that hide inside their shells, the living egg cowrie extends a velvety, black mantle speckled with white dots completely over the shell for protection and respiration.
Ecological Role
Specialized predators that feed exclusively on the polyps of soft corals and gorgonians, playing a direct role in regulating reef coral populations.
Similar Species
Other members of the Ovulidae family such as Simnia or Pellasimnia, which are typically smaller and more elongated.
Beach Finding Tips
Because these animals live on soft corals in subtidal reef environments, empty shells wash ashore occasionally after storms, but intact specimens are more frequently obtained by divers.