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Dimorphism in Kheraiceras Spath from the Callovian Chari Formation, Kutch, India

Published online by Cambridge University Press:  20 May 2016

S. Bardhan ,
K. Datta ,
S. K. Jana  and
D. Pramanik
S. Bardhan
Affiliation:
1Department of Geological Sciences, Jadavpur University, Calcutta-700032, India
K. Datta
Affiliation:
2Geology Section, Oil and Natural Gas Commission, Ankleshwar 393010, India
S. K. Jana
Affiliation:
1Department of Geological Sciences, Jadavpur University, Calcutta-700032, India
D. Pramanik
Affiliation:
1Department of Geological Sciences, Jadavpur University, Calcutta-700032, India
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Abstract

Kheraiceras Spath, 1924, is known mainly from macroconchs. Matching of dimorphic pairs at species level is difficult due to the rarity of microconchs and consequent difficulty in establishing contemporaneity. The present study reveals dimorphism within Kheraiceras cosmopolitum (Parona and Bonarelli, 1895) from the lower part of the Callovian Chari Formation, Kutch, India, where microconch closely resembles macroconch except for the size, being about three times smaller and having an aperture characterized by terminal construction. The evolution of Kheralceras from Bullatimorphites Buckman is based on macroconchs only. The discovery of coeval microconch specimens and study of known microconchs within the lineage indicate “parallel” evolution in macro- and microconchs and improves the understanding of evolutionary trends that involve complex heterochronic processes.

Type
Research Article
Information
Journal of Paleontology , Volume 68 , Issue 2 , March 1994 , pp. 287 - 293
Copyright
Copyright © The Paleontological Society 

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