†Crassatellites washingtoniana nygreni Durham 1944 (clam)
Bivalvia - Carditida - Crassatellidae
Full reference: J. W. Durham. 1944. Megafaunal zones of the Oligocene of northwestern Washington. University of California Publications in Geological Sciences 27:101 -212
Belongs to Crassatellites washingtoniana according to J. W. Durham 1944
Sister taxa: none
Type specimen: Its type locality is Olympic Foundary, which is in a Rupelian marine horizon in the Blakeley Formation of Washington
Ecology: facultatively mobile shallow infaunal suspension feeder
Distribution: found only at Olympic Foundary