Tivela (Pachydesma) (venus clam)

Bivalvia - Cardiida - Veneridae

Alternative spelling: Pachydesma

Synonym: Trigonella Conrad 1837 [replaced name]

Parent taxon: Tivela according to T. S. Oldroyd 1925

See also Clark 1915, Cox et al. 1969, Sepkoski 2002 and Wagner and Schilling 1923

Sister taxa: Tivela (Comus), Tivela (Planitivela), Tivela (Tivela), Tivela cliffensis, Tivela kelloggensis, Tivela merriami, Tivela packardi, Tivela trigonalis, Tivela vaquerosensis

Subtaxa: Pachydesma sulcataria Tivela (Pachydesma) diabloensis Tivela (Pachydesma) gabbi Tivela (Pachydesma) inezana Tivela (Pachydesma) stultorum

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Ecology: facultatively mobile infaunal suspension feeder

Distribution:

• Quaternary of Mexico (5 collections), United States (28: California)

• Pliocene of Mexico (1), United States (5: California)

• Miocene of United States (18: California)

• Oligocene of United States (1: California)

• Eocene of Canada (1: British Columbia), United States (8: California, Oregon, Washington)

Total: 67 collections including 68 occurrences

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