Foraminifera source details
Cushman, J.A. 1926. Trifarina in the American Eocene and elsewhere. Contr. Cushman Lab. Foram. Res. 1: 86-88.
183828
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Trifarina bradyi var. advena Cushman, 1926 † accepted as Trifarina advena Cushman, 1926 † (original description)