Bivalvia - Cardiida - Cardiidae
Alternative combinations: Cardium (Pingecardium) hartleyensis, Cardium hartleyensis
Full reference: B. L. Clark and A. O. Woodford. 1927. The geology and paleontology of the type section of the Meganos Formation (lower Middle Eocene) of California. University of California Publications in Geological Sciences 17(2):63-142
Belongs to Plagiocardium (Schedocardia) brewerii according to H. E. Vokes 1939
See also Clark and Woodford 1927 and Stewart 1930
Sister taxa: none
Type specimen: UCMP 31277. Its type locality is UCMP 3152, Deer Valley, which is in a Ypresian coastal sandstone in the Meganos Formation of California.
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Eocene of United States (3: California collections)
Total: 3 collections each including a single occurrence