Successional speciation in paleontology : the case of the oysters of the sellaeformis stock

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Stenzel, H. B. (Henryk Bronislaw), 1899-

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University of Texas at Austin. Bureau of Economic Geology


The successional mode of speciation of Julian Huxley (1942) may be defined as gradual transformation of one species into a successor species, or several of them, during the course of geologic time without primarily involving geographic, ecologic, or adaptive segregation. The purpose of this paper is to present a particular case of such a mode of speciation and to discuss problems involved therein. The example chosen is the stock of Cubitostrea sellaeformis (Conrad) [Mollusca, Pelecypoda], which contained 4 separate successional species of oysters and lived in Middle Eocene time in the ancient Gulf of Mexico.


To obtain a print version of this publication visit: and search for: RI0003. "Reprinted from Evolution, vol. 3, no. 1, March 1949." Bibliography: p. 50.

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