Pacific Lion's Paw Scallop (also known as Nodipecten subnodosus)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Nodipecten, Species: N. subnodosus · Pectinidae (Scallop family) · Bivalve (two-shelled, fan-shaped)
Species
Nodipecten subnodosus
Shell Type
Bivalve (two-shelled, fan-shaped)
Family
Pectinidae (Scallop family)
Size
Approximately 1.5 to 2 inches based on visible scale. This appears to be a smaller juvenile or a broken fragment, whereas typical adult specimens range from 4 to 6 inches.
Color & Pattern
Displays a mottled combination of creamy white, peach, and deep reddish-orange tones with fine concentric growth lines intersecting strong radial ribs. Colors appear completely natural with minor wear.
Rarity
Uncommon as a whole beach-found specimen, especially in intact condition outside of its direct geographic range.
Habitat
Found in shallow marine waters, typically ranging from the intertidal zone down to moderate depths of about 30 meters, attached or resting on sandy or rocky substrates in tropical to subtropical environments.
Geographic Range
Eastern Pacific Ocean, from southern California down through the Gulf of California and along the coast of Mexico to Peru.
Description
A rugged, heavy bivalve featuring strong, prominent radial ribs adorned with distinctive rounded knobs or nodes. The margin is deeply scalloped and fluted, showcasing robust structural integrity and textured sculptural relief.
Key Features
Distinguished by its heavy, thick valves, prominent rounded surface nodes on the primary ribs, unequal auricles (ears) at the hinge, and a deep reddish-orange to brownish coloration.
Collector Value
Moderately sought after by shell collectors for its architectural form and rich colors, though large, flawless adult specimens command the highest value. This smaller or fragmented specimen has modest decorative value.
Condition Notes
The specimen appears to be a smaller individual or possibly a valve fragment with some wear along the edges, but retains good structural detail and natural color. Collectibility grade is Good.
Interesting Facts
Scallops are unique among bivalves for their ability to swim by rapidly clapping their valves together, expelling water to propel themselves away from predators. They also possess a row of dozens of tiny, bright blue eyes along the edge of their mantle.
Ecological Role
Acts as an active filter feeder, improving water clarity by consuming phytoplankton. Serves as an important food source for marine carnivores such as sea stars, octopuses, and large fish.
Similar Species
Atlantic Lion's Paw Scallop (Nodipecten nodosus), which is found in the Western Atlantic and Caribbean rather than the Eastern Pacific, featuring sharper and more prominent spines.
Beach Finding Tips
Search rocky or shell-rich beaches in the Gulf of California following major storms or high tides. Look among driftlines where heavy shell debris accumulates.