Tuesday, June 5, 2007
548

Tracing the evolution of wing coupling in hydropsychid caddisflies (Trichoptera: Hydropsychidae)

Ian Stocks, Entomology, Soils, and Plant Sciences, Clemson University, 114 Long Hall, Box 340315, Clemson, SC 29634-0315 and Christy Jo Geraci, Department of Entomology, Smithsonian Institute.

Wing coupling mechanisms are common in many trichopteran taxa. Within members of the Hydropsychidae lineage a number of morphologically different coupling mechanisms have evolved. While Arctopsychinae and "Diplectroninae" adults do not couple their wings, Macronematinae and Hydropsychinae adults each have developed substantially different mechanisms for doing so. We used Mesquite software modules to trace the evolution of these mechanisms onto a phylogeny of Hydropsychidae inferred from DNA sequences from variable regions of nuclear ribosomal and mitochondrial (COI) genes. The combined analysis suggests that macronematine and hydropsychine wings have undergone convergent evolution, the end result of which is a set of morphological structures that ensure the unions of their wings for flight, and⁄or swimming.