PaleoDB taxon number: 365077
Full reference: B. L. Clark. 1938. Fauna from the Markley Formation (Upper Eocene) on Pleasant Creek, California . Bulletin of the Geological Society of America 49:683-730
Type specimen: UCMP 30879, a shell. Its type locality is UCMP A1297, which is in an Eocene marine sandstone in the Markley Formation of California.