Pacific Patinopecten or Subcircular Scallop
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Leptopecten, Species: Leptopecten latiauratus · Pectinidae (Scallop family) · Bivalve (two-shelled), whole shell, fan-shaped disc
Species
Leptopecten latiauratus
Shell Type
Bivalve (two-shelled), whole shell, fan-shaped disc
Family
Pectinidae (Scallop family)
Size
Approximately 1 to 1.5 inches, which is typical for this species. Adults generally range between 0.75 and 1.5 inches.
Color & Pattern
Vibrant reddish-brown to burnt orange base color with subtle whitish radial striations and microscopic textural details along the ribs. The coloration is completely natural and well-preserved.
Rarity
Common
Habitat
Shallow subtidal marine environments, typically found attached by byssus threads to kelp, seagrass, or rocky substrates from the low intertidal zone down to moderate depths.
Geographic Range
Eastern Pacific Ocean, ranging from central California down to the Gulf of California, Mexico, including the coastal waters of San Diego.
Description
A charming and brightly colored bivalve featuring a classic fan shape with prominent, well-defined radial ribs and asymmetrical 'ears' (auricles) near the hinge. The exterior displays a wonderful textured pattern of fine longitudinal striations crisscrossing the ribs, giving it a delicate yet sturdy appearance.
Key Features
Asymmetrical auricles at the hinge line, compressed fan-like body, numerous fine radial ribs, and a distinct reddish-orange coloration.
Collector Value
Low to moderate commercial value, but highly desirable for local beachcombers and regional collections due to its bright coloration and pleasing symmetry.
Condition Notes
Gem condition single valve with intact margins, vibrant natural color, and no apparent erosion or boring holes.
Interesting Facts
Unlike many clams that burrow into the sediment, these scallops can swim short distances by rapidly clapping their valves together to expel water, helping them escape predators like starfish.
Ecological Role
Acts as an active filter feeder improving water quality and serves as a vital food source for coastal predators such as sea stars, octopuses, and bottom-feeding fish.
Similar Species
Argopecten ventricosus (Pacific calico scallop), which is generally larger and more inflated with broader ribs.
Beach Finding Tips
Look along Southern California beaches, particularly in San Diego after winter storms or high tides, scanning the wrack line where kelp and seaweed wash ashore.
Notes
San Diego