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The genus Biplanispira Umbgrove (Foraminiferida) and its occurrence in India

Published online by Cambridge University Press:  01 May 2009

Bimal K. Samanta
Bimal K. Samanta
Affiliation:
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Calcutta 700019, India
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Abstract

Biplanispira Umbgrove is closely related to Pellatispira Boussac, from which it probably arose by the subdivision of the median chambers by the rapidly expanding marginal crest and the development of planispirally arranged secondary chambers on both sides of the peripheral flange. The genus appears to be polyphyletic, its species having been derived from different representatives of Pellatispira. Illustrated records of Biplanispira are confined to the region between eastern India and Eua, Tonga, and the genus appears to be restricted to the middle and upper parts of the Upper Eocene. In the Upper Eocene of the Garo Hills, eastern India, it is represented by B. hoffmeisteri (Whipple) and in the Andaman Islands by B. mirabilis (Umbgrove). This is the first record of the genus from mainland India.

Type
Articles
Information
Geological Magazine , Volume 121 , Issue 4 , July 1984 , pp. 311 - 318
Copyright
Copyright © Cambridge University Press 1984

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