Pacific Jewel Box (also known as the Leafy Jewel Box)
Phylum: Mollusca, Class: Bivalvia, Order: Venerida, Family: Chamidae, Genus: Chama, Species: Chama buddiana · Chamidae (Jewel Box family) · Bivalve (clams); this specimen appears to be a single valve (upper/right valve) with a fixed, heavy, sub-circular shape.
Species
Chama buddiana
Shell Type
Bivalve (clams); this specimen appears to be a single valve (upper/right valve) with a fixed, heavy, sub-circular shape.
Family
Chamidae (Jewel Box family)
Size
Approximately 1.5 to 2 inches (38-50mm) in diameter. This is within the standard adult size range of 1-3 inches for the species.
Color & Pattern
Base color is a mottled reddish-brown and tan with white highlights. The interior (not fully visible) is typically white with a purple or brownish margin. The patterns follow the concentric leafy growth lines.
Rarity
Common; specifically frequent in the Panamic province and often found washed up on rocky beaches after storms or heavy surf.
Habitat
Found in intertidal and shallow subtidal zones, typically cemented to hard substrates like rocks, coral reefs, or other shells. They are marine dwellers found on wave-swept rocky shores.
Geographic Range
Eastern Pacific range, specifically from the Gulf of California (Cabo San Lucas) south to Peru, including the Galapagos Islands.
Description
A rugged, heavy-walled bivalve characterized by its 'jewel box' appearance. The shell surface is covered in irregular, leafy, or scale-like fluted projections. It grows attached to rocks, often resulting in a distorted, asymmetrical shape that mimics its environment.
Key Features
Deeply convex valves, thick shell wall, concentric leafy lamellae (scales), and a large, visible muscle scar on the interior. The hinge has a heavy, curved tooth structure typical of Chamidae.
Collector Value
Low to Moderate ($2-$10). While beautiful, this specimen is weathered. Exceptional 'gem' quality specimens with intact long spines are more highly prized by collectors.
Condition Notes
Fair to Good. The shell shows significant weathering and erosion of the delicate leafy spines, which is common for beach-found specimens. It appears to have been glued to a card, suggesting it was part of a souvenir or educational set.
Interesting Facts
Unlike most clams that bury in sand, Jewel Boxes are 'sessile,' meaning they cement one valve permanently to a rock. They are often so well-camouflaged by algae and encrusting organisms that they are nearly invisible when alive.
Ecological Role
Provides micro-habitats for smaller marine organisms within its leafy folds. As filter feeders, they help clear the water of particulate matter. They are preyed upon by specialized sea stars and predatory snails.
Similar Species
Chama arcana (Secret Jewel Box) and Chama echinata (Thorny Jewel Box). C. buddiana is distinguished by its specific reddish-brown color and the density of its scales.
Beach Finding Tips
Look in rocky tide pools or among shell drift near the high-tide line after a storm. In Cabo, check the rocky coves where the Pacific meets the Sea of Cortez.
Notes
Cabo