1. Division of Science and Mathematics, Eastern Oklahoma State College, Idabel, Oklahoma 74745, U.S.A. (e-mail: cmcallister@se.edu)
2. HelmWest Laboratory, 2108 Hilda Avenue, Missoula, Montana 59801, U.S.A. (e-mail: wormdwb@aol.com)
3. Department of Biology, Georgia Southern University, Statesboro, Georgia 30458, U.S.A. (e-mail: ldurden@georgiasouthern.edu; sgreiman@georgiasouthern.edu)
4. Department of Biological Sciences, Quinnipiac University, Hamden, Connecticut 06518, U.S.A (e-mail: dennis.richardson@quinnipiac.edu)
5. Department of Biology, University of North Dakota, Grand Forks, North Dakota 58202-9019, U.S.A. (e-mail: vasyl.tkach@und.edu)