N Michele Holbrook1, Michael Knoblauch2. 1. Department of Organismic and Evolutionary Biology, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA. Electronic address: holbrook@oeb.harvard.edu. 2. School of Biological Sciences, Washington State University, PO Box 644236, Pullman, WA 99164-4236, USA. Electronic address: knoblauch@wsu.edu.