First issued in release COL21.6.
Last used in release COL23
Published in
Cushman, J. A., & Grant, U. S. (1927). Late Tertiary and Quaternary Elphidiums of the west coast of North America. Transactions of the San Diego Society of Natural History, 5(6): 69–82. https://www.marinespecies.org/foraminifera/aphia.php?p=sourcedetails&id=146292