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Geological Time: Paleogene Eocene
holotype
View of a specimen of Actinosiphon semmesi Vaughan, 1929
The identification is based upon:
, : Vaughan, T. W. (1929). Actinosiphon semmesi, a new genus and species of orbitoidal foraminifera, and Pseudorbitoides trechmanni H. Douvillé. Journal of Paleontology. 3: 163-169. Plate , Fig.
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