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Differences between evolution of mean form and evolution of new morphotypes: an example from Late Cretaceous planktonic foraminifera

Published online by Cambridge University Press:  08 February 2016

Michal Kucera  and
Björn A. Malmgren
Michal Kucera
Affiliation:
Department of Marine Geology, Earth Sciences Centre, Göteborg University, S-413 81 Göteborg, Sweden. E-mail: michal@gvc.gu.se
Björn A. Malmgren
Affiliation:
Department of Marine Geology, Earth Sciences Centre, Göteborg University, S-413 81 Göteborg, Sweden. E-mail: michal@gvc.gu.se
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Abstract

Morphological evolution in the Late Cretaceous (Maastrichtian) Contusotruncana lineage of planktonic foraminifera was studied at DSDP Sites 525 (South Atlantic) and 384 (North Atlantic). A multivariable approach was used to separate aspects of form controlled by geographical variation (size, spiral roundness of the test, percentage of kummerform specimens) from those due to changes that occurred simultaneously in geographically distant populations of the lineage (shell conicity, number of chambers in the last whorl).

A gradual increase in mean shell conicity was observed over the last 3 million years of the Cretaceous. It arose from the combination of a rapid development of highly conical shells after 68.5 Ma and a long-term trend of progressive disappearance of the ancestral morphotype. Therefore, despite the gradual change in “mean form,” the morphological evolution in the Contusotruncana lineage differs from the classical image of phyletic gradualism. The gradual increase in mean shell conicity in the lineage was accompanied by a remarkable decrease in its absolute abundance (shell accumulation rate), suggesting that the changes in shell morphology might not have been neutral with respect to natural selection. Apparently, gradual change in “mean form” of fossil lineages does not require an equally gradual development of morphological novelties. It may be caused by natural selection operating on a constant range of variation in populations living in environments without geographical barriers.

Type
Articles
Information
Paleobiology , Volume 24 , Issue 1 , Winter 1998 , pp. 49 - 63
Copyright
Copyright © The Paleontological Society 

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