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American Zoologist 1979 19(2):555-572; doi:10.1093/icb/19.2.555
© 1979 by The Society for Integrative and Comparative Biology
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Variation and systematics in calcareous nannofossils of the genus Sphenolithus

KENNETH M. TOWE
1Department of Paleobiology, Smithsonian Institution Washington, D.C. 20560

A quantitative and qualitative study of within-sample variation in the genus Sphenolithus Deflandre indicates the existence of significant polymorphism in this group of nannofossils. Qualitative comparison between two samples of different ages from different localities reveals two distinct ultrastructural morphologies indistinguishable in the light microscope. Statistical treatment of the quantitative data shows that the same variation exists in both samples. A number of heretofore distinct taxa are interpreted to be variants of only two species


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