Leukoma grata
NameLeukoma grata
Scientific NameLeukoma grata
Common NameGratella clam
FamilyVeneridae
GenusLeukoma
Speciesgrata
Geographic DistributionEastern Pacific Ocean, ranging from Southern California (USA) down to Peru, including Baja California, Mexico.
Habitatintertidal
Average Size (mm)30
Identifying FeaturesDistinctive dark brown and white zigzag/chevron color patterns, prominent concentric growth lines, fine radial sculpture, and a finely crenulated internal shell margin. It is a bivalve with equivalve and inequilateral shells.
Dietfilter-feeder
Raritycommon
Author Citation(Say, 1831)
Description
Leukoma grata is a bivalve mollusk, commonly known as the Gratella clam. Its shell is characterized by an ovate to subtrigonal shape, with moderate inflation. The exterior surface displays prominent concentric growth lines and fine radial sculpture, which can create a slightly cancellate texture. The most striking feature is its highly variable and intricate color pattern, typically consisting of dark brown or black markings on a creamy white or light tan background, often forming zigzag, chevron, or blotchy patterns. The umbones are slightly anterior, and the interior margin of the shell is finely crenulated.
