The 2005 ESA Annual Meeting and Exhibition
December 15-18, 2005
Ft. Lauderdale, FL

Please note: Recorded presentations are still being processed and added to the site daily. If you granted permission to record and do not see your presentation, please keep checking back. Thank you.

Friday, December 16, 2005 - 9:42 AM
0233

Building a tree of sticks: Phylogeny and evolution of Phasmatodea

James A. Robertson, jrobertson@bugs.ent.uga.edu, University of Georgia, Department of Entomology, 413 Biological Sciences Building, Athens, GA, Sven Bradler, sbradle@gwdg.de, Georg August Universitat Gottingen, Institut fur Zoologie und Anthropologie, Berliner Str. 28, Gottingen, Germany, and Michael Whiting, michael_whiting@byu.edu, Brigham Young University, Integrative Biology, 401 WIDB, Provo, UT.

While the monophyly of the order Phasmatodea (stick and leaf insects) and its placement among the remaining insect orders is well supported, many aspects of phasmid phylogeny and evolution remain controversial. Recent morphological and molecular phylogenetic studies all corroborate a Timema + Euphasmatodea (all remaining species) sister grouping, however the basal relationships within Euphasmatodea remain equivocal. Furthermore, current molecular data support a loss of wings at the base of the phasmid clade followed by a long diversification of wingless taxa with wings later recovered independently in multiple lineages throughout phasmid evolution. Approximately 60 morphological characters of the adult form and egg capsule and DNA sequence data (18S rDNA, 28S rDNA, 12S rDNA, 16S rDNA, histone 3, and COII) were obtained for a broad taxonomic sampling within Phasmatodea (~150 taxa). Phylogenetic analyses of these data were performed via Direct Optimization using parsimony and likelihood criteria. The basal diversification of Phasmatodea is investigated to specifically identify the basal most lineage of Euphasmatodea and to test the phasmid loss and recovery of wings hypothesis. These analyses suggest that 1) a clade comprising mostly Diapheromerine taxa form the basal most lineage of Euphasmatodea, 2) the phasmid wing recurrence hypothesis is supported, and 3) there are multiple independent origins of phasmid egg laying strategies. Other taxonomic and biological implications are discussed in light of this phylogeny.


Species 1: Phasmatodea Heteronemiidae (walking sticks, stick insects)
Species 2: Phasmatodea Phasmatidae (walking sticks, stick insects)
Species 3: Phasmatodea Pseudophasmatidae (walking sticks, stick insects)
Keywords: Wing recurrence, Oviposition techniques

[ Recorded presentation ] Recorded presentation