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The Journal of Foraminiferal Research; October 2003; v. 33; no. 4; p. 277-284; DOI: 10.2113/0330277
© 2003 Cushman Foundation for Foraminiferal Research
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Article

MOLECULAR DATA REVEAL PARALLEL EVOLUTION IN NUMMULITID FORAMINIFERA

Maria Holzmann1, Johann Hohenegger1 and jan Pawlowski2

1 Institut für Paläontologie, Geozentrum, Universität Wien, 1090 Wien, Austria.
2 Department of Zoology and Animal Biology, University of Geneva, CH-1211 Geneva 4, Switzerland. E-mail: Jan.Pawlowski{at}zoo.unige.ch

Nummulitidae are the largest extant calcareous Foraminifera, and are widely distributed in tropical and subtropical shallow-water seas. Classical morphology-based taxonomy divides the Nummulitidae in two subfamilies, the Nummulitinae and Heterostegininae, according to the presence or absence of secondary septa. To test the evolutionary importance of this morphological feature, phylogenetic relationships of five Recent nummulitid genera were investigated by sequencing fragments of the SSU and LSU rRNA gene. According to our results, species characterized by septate chambers (Heterostegina depressa, Planostegina operculinoides, and Cycloclypeus carpenteri) either group with species lacking septate chambers (Operculina ammonoides, Nummulites venosus) or branch separately. This suggests that chamber subdivisions developed several times independently in the evolutionary history of the Nummulitidae, providing an example of parallel evolution in Foraminifera.




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Micropaleontology, July 1, 2004; 50(2): 149 - 177.
[Abstract] [Full Text] [PDF]


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