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Morphometrics of the Paleocene coccolith genera Cruciplacolithus, Chiasmolithus, and Sullivania: a complex evolutionary history

Published online by Cambridge University Press:  08 April 2016

Timothy J. Bralower  and
Matthew Parrow
Timothy J. Bralower
Affiliation:
Department of Geology, University of North Carolina, Chapel Hill, North Carolina 27599-3315
Matthew Parrow
Affiliation:
Department of Geology, University of North Carolina, Chapel Hill, North Carolina 27599-3315
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Abstract

Investigation of the evolution of calcareous nannoplankton is hindered by the extremely small size (5-10 μm) of their fossils. We introduce new technology, a scanning electron microscope connected to an image analysis system (SEM-IAS), which allows this field to be explored as never before. This system enables a host of morphocharacters to be measured and included in studies of phylogeny and evolutionary dynamics. We have applied the SEM-IAS to study the evolution of Paleocene coccolith genera Cruciplacolithus, Chiasmolithus, and Sullivania. A variety of detailed measurements have been made on over 4000 coccoliths from Deep Sea Drilling Project Site 384 in the temperate North Atlantic and Ocean Drilling Program Site 690 in the Weddell Sea off Antarctica. Our results indicate no simple relationships between morphocharacters, the shapes of all three genera are both complex and highly variable. Although most morphocharacters possess little phylogenetic significance, the areas of different shield cycles show gradual divergence between Chiasmolithus and Sullivania through the Paleocene. Change of most other morphocharacters occurs at variable rates and reversals in trends are common. Minimal correlation exists between the trends and oscillatory shape changes observed at the two sites. We conclude that these trends and oscillations represent local, transitory ecophenotypic variation of the complex form. There is little stasis in the ten-million-year record studied.

Type
Articles
Information
Paleobiology , Volume 22 , Issue 3 , Summer 1996 , pp. 352 - 385
Copyright
Copyright © The Paleontological Society 

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