This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
Corresponding author (Name, Year)
Ref.: U. S. Grant, IV and H. R. Gale. 1931. Catalogue of the Marine Pliocene and Pleistocene Mollusca of California. Memoirs of the San Diego Society of Natural History 1:1-1036