Pacific Lion's Paw Scallop (also known as the Subnodosus Scallop)
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Nodipecten, Species: N. subnodosus · Pectinidae (Scallop family) · Bivalve (two-shelled), whole shell, fan-shaped disc with prominent radial ribs
Species
Nodipecten subnodosus
Shell Type
Bivalve (two-shelled), whole shell, fan-shaped disc with prominent radial ribs
Family
Pectinidae (Scallop family)
Size
Approximately 4 to 5 inches in width, which is a standard adult size for this species. Adults typically range from 3 to 6 inches, with exceptionally large specimens reaching up to 7 inches.
Color & Pattern
Vibrant, solid bright orange coloration throughout the exterior surface with lighter yellowish undertones on the ribs. The color appears completely natural, rich, and saturated without significant sun-bleaching. The surface has a subtle glossy sheen over finely textured radial ribbing.
Rarity
Common to Uncommon. While widely distributed within its native range, vibrant brightly colored specimens in pristine condition are highly prized by collectors.
Habitat
Found in shallow marine waters to moderate depths, typically ranging from intertidal zones down to about 40 meters. They prefer hard substrates, sandy bottoms near rocky reefs, and areas with good tidal currents where they can filter feed effectively.
Geographic Range
Eastern Pacific Ocean, ranging from the Gulf of California (Sea of Cortez) south along the coast of Mexico and Central America to Peru.
Description
A magnificent and heavy bivalve shell featuring a classic fan shape with prominent, rounded radial ribs radiating from the umbo to a scalloped margin. The shell displays robust structural integrity with symmetrical auricles (ears) flanking the beak. The texture is rough yet finely striated, providing a tactile experience that highlights its sturdy nature as a swimming bivalve.
Key Features
Characterized by its heavy, solid construction, numerous rounded radial ribs, unequal auricles at the hinge, and a striking, uniform vivid orange or reddish-orange coloration. The distinct node-like swellings on the ribs differentiate the genus Nodipecten from standard scallops.
Collector Value
Moderately high collector value, especially for specimens exhibiting intense, unbroken coloration like brilliant orange or deep red. While commercially harvested for food in parts of Mexico, perfect collector-grade shells command a solid price among conchologists.
Condition Notes
Gem to Fine condition. The shell is entirely intact with no major chips, fractures, or structural damage along the delicate scalloped margins. The color is exceptionally vibrant with no visible fading, erosion, or boring marks from marine parasites.
Interesting Facts
Unlike most bivalves that remain stationary, scallops like Nodipecten subnodosus can swim by rapidly snapping their valves together to expel water, propelling themselves backward to escape predators such as sea stars and octopuses. They also possess dozens of tiny, bright blue eyes along the edge of their mantle that can detect light and shadow.
Ecological Role
As filter feeders, these scallops play an essential role in maintaining coastal water clarity by consuming suspended phytoplankton and organic particles. They serve as a vital food source for numerous marine carnivores, including large fish, sea stars, and octopuses.
Similar Species
Nodipecten nodosus (Lion's Paw Scallop), which is found in the Western Atlantic and Caribbean. N. subnodosus can be distinguished by its Pacific origin, slightly smoother nodulation on the ribs, and differences in the shape of the auricles.
Beach Finding Tips
Finding a whole, brightly colored N. subnodosus on a beach is quite rare due to their sub-tidal habitat. Scuba diving or snorkeling near rocky reefs and sandy bottoms in the Gulf of California is the best way to encounter live specimens or pristine discarded valves.