Lion's Paw Scallop (Fossilized or Darkly Stained)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Nodipecten, Species: Nodipecten nodosus · Pectinidae (Scallop family) · Bivalve (two-shelled), fan-shaped valve fragment or small juvenile shell
Species
Nodipecten nodosus
Shell Type
Bivalve (two-shelled), fan-shaped valve fragment or small juvenile shell
Family
Pectinidae (Scallop family)
Size
Approximately 1.5 to 2 inches in width. Typical adult Nodipecten nodosus specimens range from 3 to 6 inches.
Color & Pattern
Dark charcoal gray to near-black coloration, likely due to fossilization, mineral staining, or deep-water organic staining. Hints of reddish-orange undertones peek through near the umbo.
Rarity
Uncommon as a whole beach find; this particular dark-stained or fossilized specimen is a fascinating and less common variation.
Habitat
Marine environment, typically found in shallow to moderately deep subtidal waters attached to hard substrates or resting on coarse sand, coral rubble, and shell hash.
Geographic Range
Western Atlantic, ranging from North Carolina through the Caribbean, Gulf of Mexico, and down to Brazil.
Description
A striking fan-shaped bivalve valve featuring prominent, rounded radial ribs and distinct nodal swellings characteristic of the Nodipecten genus. The surface shows a rugged, weather-worn texture with notable boreholes, likely from predatory carnivorous snails or boring sponges, highlighting its long marine history.
Key Features
Distinguished by its heavy, robust fan shape, strong radial plications (ribs), and the presence of characteristic prominent knobs or nodes along the ribs.
Collector Value
Low to Moderate commercial value due to being a single worn valve, but holds high curiosity and educational value for collectors interested in fossilized or stained specimens.
Condition Notes
Fair to Good condition. It is a worn, dark-stained valve fragment showing distinct predatory boring holes (naticid or murex drill holes), indicating it spent significant time on the seabed.
Interesting Facts
Lion's paws are capable of swimming by rapidly clapping their valves together to expel water, allowing them to escape threats such as predatory starfish.
Ecological Role
Filter feeders that clean the water column by consuming phytoplankton. They serve as an important food source for marine predators such as octopuses, sea stars, and large fish.
Similar Species
Pacific Lion's Paw (Nodipecten subnodosus), which is generally larger and found in the Eastern Pacific.
Beach Finding Tips
Look along high-energy beaches and shell beds after major storms, particularly in areas near coral reefs or rocky outcrops in the southeastern US and Caribbean.