Steffens, W.P. 2001. Status survey for Ophiogomphus anomalus Harvey, and early-season dragonfly inventory of western Superior National Forest Rivers. Final report submitted to the Natural Heritage and Nongame Research Program, Minnesota Department of Natural Resources. 13 pp.
Status surveys for the Special Concern dragonfly, Ophiogomphus anomalus, were conducted on selected rivers in northeastern Minnesota, along with an inventory of other early-season river dragonflies. Ophiogomphus anomalus were confirmed on the upper St. Louis River in St. Louis County, but no new occurrences were found. Additional evidence of developmental abnormalities in northern Minnesota dragonfly larvae was found at several locations.