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Abstract Detail

Systematics Section

Ruhfel, Brad R [1], Bittrich, Volker [2], Gustafsson, Mats H. G. [3], Philbrick, C. Thomas [4], Rutishauser, Rolf [5], Stevens, P. F. [6], Davis, III, Charles C. [1].

Systematics and biogeography of the clusioid clade (Malpighiales).

The clusioid clade (Malpighiales) includes four families as currently circumscribed (Bonnetiaceae, Clusiaceae, Hypericaceae, and Podostemaceae) representing 87 genera and ~2,000 species. Recent phylogenetic investigations indicate that Clusiaceae are not monophyletic, but this result remains to be tested with dense taxon sampling. We present the first taxon-rich mutligene phylogeny of the clusioids using plastid (matK and ndhF) and nuclear (phyC) sequence data. Our results indicate that Clusiaceae, and other traditionally recognized taxa, are not monophyletic. We also report the first ndhF sequences for the morphologically bizarre aquatic plant family Podostemaceae, and the first known duplication of phyC in angiosperms. This phylogeny not only enhances our efforts to interpret patterns of character evolution and assess classification of the clusioids, but it also allows us to better determine the phylogenetic placement of the clusioid fossil, Paleoclusia chevalieri Crepet & Nixon, which is one of the oldest rosid macrofossils. Molecular divergence time estimations including this fossil and others indicate an ancient Gondwanan origin of the clusioids, followed by several, apparently simultaneous, bursts of diversification more recently during the Cenozoic.

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Related Links:
C. C. Davis Web site
B. R Ruhfel Web site

1 - Harvard University, Department of Organismal and Evoloutionary Biology, 22 Divinity Ave., Cambridge, MA, 02138
2 - Universidade Estadual de Campinas, Biologia Vegetal , Caixa Postal 6109, Campinas, Sao Paulo, 13083 970, Brazil
3 - University of Aarhus, Systematic Botany, Institute of Biological Sciences, Ole Worms Allé, building 1137, Aarhus C, 1137, Denmark
4 - Western Connecticut State University, Biological & Environmental Sciences, 181 White Street, Danbury, Connecticut, 06810, USA
5 - Universitat Zurich , Institut fur Systematische Botanik, Zollikerstrasse 107, CH-8008, Zurich, Switzerland
6 - University of Missouri st Louis, Biology, 1 University Boulevard, St Louis, MO, 63121, U. S. A.

divergence time estimates
biome evolution.

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 57
Location: Maybird/Cliff Lodge - Level C
Date: Wednesday, July 29th, 2009
Time: 9:15 AM
Number: 57006
Abstract ID:808