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Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 119, Figs. 19-20: Holocene, Chukchi Sea, off Alaska, USA. Side and top views, x 100 (from Loeblich and Tappan, 1953).
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Image source: Höglund, H. 1947. Foraminifera in the Gullmar fjord and the Skagerak. Zoologiska Bidrag från Uppsala 26: 1-328 + 32 pls. Uploaded with written permission from the copyright owners Annalena Höglund and Jan Höglund.
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location: Hornsund Source: http://www.iopan.gda.pl/projects/biodaff/EMBS-06.html
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Spiroplectammina biformis sensu Jones, R.W. 1994. The Challenger Foraminifera. Image source: Brady, H.B. (1884) Pl. 45
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Image source: Spiroplectammina biformis in Höglund, H. 1947. Foraminifera in the Gullmar fjord and the Skagerak. Zoologiska Bidrag från Uppsala 26: 1-328 + 32 pls. Uploaded with written permission from the copyright owners Annalena Höglund and Jan Höglund.
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Image source: Cushman, J.A. 1932. The Foraminifera of the Tropical Pacific Collections of the ”Albatross”. Part I. Astrorhizidae to Trochamminidae. Bull. U.S. Nation. Mus 161: vi+88 pp.+17 pls.