Scotch Bonnet Fragments / Scallop Shell Fragments
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Argopecten, Species: Argopecten irradians · Pectinidae (Scallop family) · Bivalve (two-shelled) shell fragments exhibiting distinct fan-like radial ribs.
Species
Likely Argopecten irradians (Bay Scallop) or Nodipecten nodosus (Lion's Paw) shell fragments
Shell Type
Bivalve (two-shelled) shell fragments exhibiting distinct fan-like radial ribs.
Family
Pectinidae (Scallop family)
Size
The fragments range from approximately 1 to 2.5 inches in length. Whole adults of the likely species typically range from 2 to 4 inches.
Color & Pattern
Cream to off-white base with distinct alternating reddish-brown or orange blocks/spots aligned along the prominent radial ribs, showing natural weathering.
Rarity
Very Common as fragments along coastal beaches within their range.
Habitat
Shallow marine waters, typically found in seagrass beds, sandy bottoms, and shallow bays.
Geographic Range
Western Atlantic Ocean, ranging from Nova Scotia down to the Gulf of Mexico, the Caribbean, and South America.
Description
These are broken fragments of bivalve shells displaying strong radial ribs, characteristic cancellate micro-sculpture, and attractive banded coloration patterns.
Key Features
Pronounced radial ribs, symmetrical fan-like corrugations, and characteristic rectangular reddish color blotches across the ribs.
Collector Value
Very low individual value due to being fragments, though whole pristine specimens of related species like the Lion's Paw are highly sought after.
Condition Notes
All pieces are broken fragments showing moderate wear, sun-bleaching, and smooth fractured edges. Collectibility grade: Study/Craft grade.
Interesting Facts
Scallop shells are unique among bivalves for their ability to swim actively by clapping their valves together, and they possess dozens of simple blue eyes.
Ecological Role
Scallops serve as important filter feeders and provide a vital food source for numerous marine predators including rays, sea stars, and carnivorous gastropods.
Similar Species
Other members of the Pectinidae family, such as the Atlantic Bay Scallop or Calico Scallop, which can be distinguished by rib count and exact color patterns.
Beach Finding Tips
Look along the wrack line on high-energy sandy beaches after storms, particularly near grass flats or shallow inlets.