Histrionica Venus Clam Shell, Leukoma histrionica 

Histrionica Venus Clam Shell, Leukoma histrionica. Shell collected off the beach at Punta Chivato, Baja California Sur, March 2026. Size: 3.0 cm (1.2 inches) x 3.7 cm (1.5 inches) x 1.6 cm (0.6 inches). Collection, photograph and Identification courtesy of Colin Campbell, DVM, Punta Chivato, Baja California Sur.

Histrionica Venus Clam Shell, Leukoma histrionica. Shell collected off the beach at Punta Chivato, Baja California Sur, May 2025. Size: 3.2 cm (1.3 inches) x 3.8 cm (1.5 inches) x 1.1 cm (0.4 inches). Collection, photograph and Identification courtesy of Colin Campbell, DVM, Punta Chivato, Baja California Sur.

Phylogeny: The Histrionica Venus Clam Shell, Leukoma histrionica (G.B. Sowerby I, 1835), is a bivalve mollusk that is a member of the Veneridae Family of Venus Clam Shells. The  Leukoma Genus is one of one hundred seven genera in the Veneridae Family, and there are twenty-three species in the Leukoma Genus.

Description:  Histrionica Venus Clam Shells have a quadrate to ovate outline and a moderately inflated profile. The shells are thick in structure. These shells are sculpted with around 80 flat radial ribs, which are crossed with widely spaced commarginal striae. The exterior of the shell is cream, tan, or whitish in color, often with  brown to darker purple bands, chevrons, or maculations. The interior is white with brown to purple blush or blotches.  The hinge plate is narrow compared to most similar shells in the region. Histrionica Venus Clam Shells reach a maximum of 5.6 cm (2.2 inches) in length.

Habitat and Distribution: Histrionica Venus Clam Shells are found on sand or muddy sand, primarily in the intertidal zone. They are a subtropical to tropical Eastern Pacific species that are found in all Mexican waters of the Pacific Ocean with the exception that they are absent from the west coast of the Baja Peninsula and north of Guaymas, Sonora in the Sea of Cortez.

Ecology and Behavior:  Histrionica Venus Clam Shells are a poorly studied and documented species. Little is known about their behavior. They are suspension feeders that feed primarily on plankton and suspended organic matter. Their specific diet is not documented. It is thought that they, like other Leukoma species are preyed upon by crabs, octopus, snails and starfish. They are gonochoric and reproduce sexually, through broadcast spawning, with external fertilization. From a conservation perspective the Histrionica Venus Clam Shell has not been formally evaluated.  The Histrionica Venus Clam Shell is is edible and has been utilized as a food source for humans for thousands of years.

Synonyms:  Venus histrionica and Venus muscaria.