Chestnut Cowrie
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Cypraeidae, Genus: Neobernaya, Species: N. spadicea · Cypraeidae (Cowrie family) · Gastropod (Univalve); Oval/Globose shape with a narrow, toothed aperture.
Species
Neobernaya spadicea
Shell Type
Gastropod (Univalve); Oval/Globose shape with a narrow, toothed aperture.
Family
Cypraeidae (Cowrie family)
Size
Approximately 1.25 inches (32mm) in length. This is a sub-adult or slightly small specimen; adults typically range from 1 to 2.5 inches.
Color & Pattern
Features a creamy white or bluish-white base on the margins and base. The dorsal surface has a rich, chestnut-brown 'saddle' or patch. Small purplish-pink spots are visible on the lateral margins, which is a key identification mark for this species. Some bleaching and salt-wear are present.
Rarity
Common to Uncommon. While the species is localized, beach-worn specimens are common in the southern part of their range, though live-taken museum quality shells are more elusive.
Habitat
Subtidal marine environment, typically found among rocky reefs, kelp forests, and under ledges. Found from the low intertidal zone down to depths of about 150 feet.
Geographic Range
Eastern Pacific Coast, specifically from Monterey Bay, California, south to Central Baja California, Mexico.
Description
A smooth, highly polished gastropod shell characterized by its distinct brown dorsal patch. The shell is ovate and somewhat inflated. The aperture is long and narrow, with fine 'teeth' (crenulations) running along both the labial and columellar lips. The surface lacks any ribs or spines, as is typical for the cowrie family.
Key Features
The rich brown 'saddle' on the top of the shell, the purple-pink spotting along the creamy white margins, and the narrow, toothed aperture.
Collector Value
Modest ($5–$15 range). It is highly desirable for regional collectors because it is a unique temperate-water cowrie, but beach-worn specimens have lower commercial value than 'live-collected' glossy specimens.
Condition Notes
Fair to Good. The shell shows signs of being 'beach-worn,' meaning it has lost some of its high-gloss vitreous enamel due to sand abrasion and sun exposure. The purple spotting is still visible, which is an excellent diagnostic feature.
Interesting Facts
The Chestnut Cowrie is the only species of cowrie native to the cold waters of the California coast. In the living animal, the mantle (the tissue that builds the shell) is flesh-colored with dark spots and completely covers the shell to keep it polished and protected.
Ecological Role
They are nocturnal scavengers and carnivores, primarily feeding on sponges, bryozoans, and sea anemones. They serve as a food source for octopuses and certain crabs.
Similar Species
Most cowries are tropical. This species is unique in its range, but it may be confused with small Lyncina vitellus (Pacific Deer Cowrie) if the locality is unknown, though the Chestnut Cowrie lacks white spots on the brown patch.
Beach Finding Tips
Look in tide pools and among kelp wrack after heavy winter storms along the Southern California coast. They are most frequently found at very low tides in rocky areas.