†Trachycardium (Dallocardia) quadragenarium fernandoensis Arnold 1907 (cockle)
Bivalvia - Cardiida - Cardiidae
Alternative combinations: Cardium quadragenarium fernandoensis, Cardium quadrigenarium fernandoensis
Full reference: R. Arnold. 1907. New and characteristic species of fossil mollusks from the oil-bearing Tertiary formations of southern California. Proceedings of the United States National Museum 32(1545):525-546
Belongs to Trachycardium (Dallocardia) quadragenarium according to E. J. Moore 2003
See also Arnold 1907
Sister taxa: none
Type specimen: USNM 164947
Ecology: facultatively mobile infaunal suspension feeder
Distribution: found only at UCMP loc. 1601, Elsmere Canyon (Pliocene of California)