Zigzag Scallop / Ziczac Scallop
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Euvola, Species: E. ziczac · Pectinidae (Scallop family) · Bivalve, whole juvenile or small adult shell, fan/disc shaped
Species
Euvola ziczac
Shell Type
Bivalve, whole juvenile or small adult shell, fan/disc shaped
Family
Pectinidae (Scallop family)
Size
Approximately 1 inch (25 mm) in width, which corresponds to a small or juvenile specimen. Adults typically range from 2 to 4 inches (50-100 mm).
Color & Pattern
Base color is off-white to pale cream, adorned with distinctive reddish-brown to dark purple zigzag or V-shaped markings radiating downward from the umbo. The colors appear natural and well-preserved.
Rarity
Uncommon to Common depending on the specific collecting locality, though whole small specimens with clear markings are prized by beachcombers.
Habitat
Found in shallow subtidal waters down to moderate depths, typically inhabiting sandy or muddy bottoms, often among seagrass beds.
Geographic Range
Western Atlantic Ocean, including the Caribbean Sea, the Gulf of Mexico, and down to Brazil.
Description
A charming and compact bivalve showcasing a distinctly asymmetrical fan shape characteristic of the genus Euvola. The exterior features strong radial ribs crossed by fine concentric growth lines, creating a textured grid-like appearance. The prominent zigzag color patterns provide excellent natural camouflage against sandy seafloors.
Key Features
Asymmetrical flat-topped valves, radial ribs, and the unmistakable dark zigzag markings that break up the pale background color.
Collector Value
Moderately collectible. While common in certain Caribbean localities, fine, undamaged specimens with vibrant zigzag patterns are always welcome additions to a display case, usually valued at a low-to-moderate price point.
Condition Notes
Good condition with intact margins, clear pattern preservation, and no major structural fractures or boring marks. Minor natural wear on the umbo.
Interesting Facts
Scallop eyes are remarkably complex; Euvola ziczac possesses dozens of tiny, glowing blue eyes along the mantle edge that can detect motion and changes in light.
Ecological Role
Acts as an active filter feeder helping to maintain water clarity. Serves as an important food source for marine predators including crabs, rays, and sea stars. Unregulated overfishing for food can impact local populations.
Similar Species
Peniagone or other small juvenile scallops, but distinguished easily by the sharp, angular zigzag markings and specific rib count of E. ziczac.
Beach Finding Tips
Search the strandline on Caribbean or Floridian beaches after storm events or high tides, specifically looking among shell drift on fine sandy beaches.