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The occurrence of hinge reversal in Buntonia beninensis Reyment (Ostracoda), Paleocene, Nigeria

Published online by Cambridge University Press:  14 July 2015

Edward A. Okosun
Edward A. Okosun*
Affiliation:
Geological Survey Department, P.M.B. 2007, Kaduna, Nigeria
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Extract

A microfossil study of two boreholes, Araromi and Gbekebo (Geological Survey of Nigeria borehole numbers 1131 and 1132) (Figure 1), revealed the occurrence of Buntonia beninensis Reyment (1960, 1963) in the late Paleocene interval. This species was found to have forms with normal overlap and hinge element and forms with a reversal of these morphological features. In the former, the left valve is larger than the right, which bears the projecting terminal hinge element, whereas, in the latter, the larger valve is the right valve with the smaller left valve bearing the projecting terminal hinge element.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 62 , Issue 4 , July 1988 , pp. 654 - 656
Copyright
Copyright © The Paleontological Society 

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References

Alexander, C. I., and Alexander, C. W. 1933. Reversal of valve size and hinge structure in a species of the genus Cytheridea. The American Midland Naturalist, 14(3):280–283.CrossRefGoogle Scholar
Al-Abdul-Razzaq, S. 1980. New Eocytheropteron species with reversed valve structure. Micropaleontology, 26:444–448.CrossRefGoogle Scholar
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Reyment, R. A. 1963. Studies on Nigeria Upper Cretaceous and lower Tertiary Ostracoda. Pt. II: Danian, Peleocene and Eocene Ostracoda. Stockholm Contributions in Geology, Vol. 10, 286 p.Google Scholar