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Spirillina concavoconvexa Galloway and Ryniker, 1930       

Class: Spirillinata  Subclass: Spirillinana  Order: Spirillinida  Family: Spirillinidae

Occurrence in    USA   American South   North America

Age: Carboniferous  Pennsylvanian  Lower Pennsylvanian

View of Spirillina concavoconvexa Galloway and Ryniker, 1930
paratype

REPOSITORY: American Museum of Natural History, NY
Microfossil Type Catalog Number: AMNH-FI-88888

Courtesy of AMNH, Invertebrate Paleontology, New York

REFERENCE: Galloway, J. J., Ryniker, C., 1930.
Foraminifera from the Atoka formation of Oklahoma.
Oklahoma Geological Survey, Circular 21 Pl.1, F.2 A-C.