none
Geological Time: Paleogene Eocene
holotype
View of a specimen of Amphistegina californica Cushman and Hanna, 1927
The identification is based upon:
, : Cushman, J. A.; Hanna, M. A. (1927). Foraminifera from the Eocene near San Diego, California. Transactions of the San Diego Society of Natural History. 5(4): 45-64. Plate , Fig.
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