†Willimactra (Petromactra) Saul 1973 (clam)
Bivalvia - Cardiida - Mactridae
Alternative spelling: Petromactra
Full reference: L. R. Saul. 1973. Evidence for the origin of the Mactridae (Bivalvia) in the Cretaceous. University of California Publications in Geological Sciences 97:1-51
Parent taxon: Willimactra according to Saul 1973
See also Saul 1973
Sister taxon: Willimactra (Willimactra)
Subtaxa: Willimactra (Petromactra) mathewsonii Willimactra (Petromactra) truncata
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Cretaceous of Mexico (1 collection), United States (8: California, South Dakota)
Total: 9 collections each including a single occurrence