found in the North Atlantic
unknown none
Geological Time: Quaternary Holocene recent
the drawings are published in the book cited below, author and collection:
View of a specimen of Spirillina margaritifera Williamson, 1858
The identification is based upon:
Cushman, J., A., 1931: The Foraminifera of the Atlantic Ocean. Part 8. Rotaliidae, Amphisteginidae, Calcarinidae, Cymbaloporettidae, Globorotaliidae, Anomalinidae, Planorbulinidae, Rupertiidae and Homotremidae. Smithsonian Institution United States National Museum Bulletin 104. Plate 1, Fig. 11
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