Pacific Lion's Paw Scallop (also known as the Nodipecten subnodosus)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Nodipecten, Species: Nodipecten subnodosus · Pectinidae (Scallop family) · Bivalve, fan-shaped whole valve
Species
Nodipecten subnodosus
Shell Type
Bivalve, fan-shaped whole valve
Family
Pectinidae (Scallop family)
Size
Approximately 4 to 5 inches across, which is within the typical range for this species. Adults generally range from 3 to 7 inches.
Color & Pattern
Rich mottled pattern featuring earthy tones of reddish-brown, deep purple, and creamy white. The coloration is entirely natural, displaying distinct radial banding with fine textural striations.
Rarity
Common to Uncommon, frequently sought by divers and occasionally washing up in suitable regions.
Habitat
Shallow subtidal waters, usually found resting on sandy or gravelly bottoms attached by byssus threads when young or unattached as adults, down to depths of about 40 meters.
Geographic Range
Eastern Pacific Ocean, ranging from the Gulf of California (Sea of Cortez) down along the coast of Mexico to Peru.
Description
A robust, heavy-shelled bivalve with a classic fan shape. It features strong, prominent radial ribs adorned with distinctive rounded knobs or nodes along the ridges, characteristic of the Nodipecten genus. The margins are deeply scalloped and wavy, creating a rugged and architectural profile.
Key Features
Heavy, thick valves with prominent radial ribs, distinct rounded nodes or knobs on the ribs, and asymmetrical auricles (ears) at the hinge.
Collector Value
Moderately high collector value due to their attractive structural knobs and rich coloration. Specimens in prime condition with intact nodes and deep colors are popular display pieces.
Condition Notes
Good condition with minor wear on the exterior margins. Natural coloration is well-preserved without severe bleaching. Collectibility grade is Fine.
Interesting Facts
Unlike many bivalves that remain stationary, Lion's Paw scallops are capable of swimming short distances by clapping their valves together to expel water, allowing them to escape predators like sea stars.
Ecological Role
Acts as an active filter feeder helping to maintain water clarity. Serves as an important food source for marine predators such as octopuses, sea stars, and large fish.
Similar Species
Atlantic Lion's Paw Scallop (Nodipecten nodosus), which is found in the Western Atlantic and Caribbean instead of the Pacific, featuring similar knobbed ribs.
Beach Finding Tips
Best found by scuba diving or snorkeling in shallow rocky-sand areas within its native range, or searching remote beaches following heavy storm surges.