Smooth Scallop (also known as the Glabra Scallop)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Euvola, Species: Euvola glabra · Pectinidae (Scallop family) · Bivalve (two-shelled, fan-shaped whole shell)
Species
Euvola glabra
Shell Type
Bivalve (two-shelled, fan-shaped whole shell)
Family
Pectinidae (Scallop family)
Size
Approximately 2.5 to 3 inches in width, which is average for this species. Adults typically range from 2 to 4 inches.
Color & Pattern
Rich deep brown to burgundy base coloration transitioning into warm reddish-orange hues near the umbo and hinge. The surface is smooth and glossy with very fine radial striations and concentric growth lines that catch the light, revealing a subtle sheen. The colors are entirely natural and well-preserved.
Rarity
Common to Uncommon, depending on the specific regional locality and beach conditions.
Habitat
Inhabits marine environments in shallow subtidal zones to moderate depths, typically resting on sandy or muddy substrates attached by a byssus when young, or free-living on the seafloor as adults.
Geographic Range
Found in the Indo-Pacific region and Australian waters, preferring warm, tropical to subtropical marine ecosystems.
Description
An exquisite bivalve featuring a classic fan shape with remarkably smooth contours. Unlike heavily ribbed scallops, this specimen exhibits a polished, sleek exterior surface with subtle, fine radial lines radiating from the prominent umbo. The auricles (ears) near the hinge are well-defined and symmetrical, contributing to its balanced, elegant silhouette.
Key Features
Smooth, glossy exterior surface with a lack of prominent heavy ribs, distinct symmetrical auricles at the hinge, and a striking gradient of deep brown to reddish-orange coloration near the beak.
Collector Value
Moderately high for shell enthusiasts who appreciate smooth, beautifully colored pectinids. Specimens with intact glossy surfaces and deep natural coloration command a steady demand in shell collecting circles, generally valued at a modest accessible price range.
Condition Notes
Gem to Fine condition. The shell is fully intact with no major chips or structural fractures. The coloration is rich and unfaded, and the margins are smooth and well-preserved.
Interesting Facts
Scallops are among the few bivalves that can actively swim. By rapidly clapping their valves together, they expel water to jet-propel themselves away from predators like starfish. They also possess dozens of tiny, bright blue eyes along the mantle edge that can detect light and motion.
Ecological Role
Scallops serve as an important prey species for various marine carnivores including sea stars, crabs, octopuses, and fish. As filter feeders, they also help maintain water clarity by consuming suspended phytoplankton and organic particles.
Similar Species
Can be confused with other smooth or low-ribbed scallops within the Pectinidae family, such as species of Amusium or other Euvola, but is distinguished by its specific coloration gradient and finer radial micro-striations.
Beach Finding Tips
Best found by beachcombing after heavy storms or high tides on tropical and subtropical sandy beaches, or by diving in shallow subtidal seagrass beds and sandy flats.