Abstract
Abstract During July 2011, collections of several freshwater horsehair worms were made at two sites (Mud and Salt creeks) in McCurtain County, Oklahoma. The specimens were subsequently identified as Paragordius varius (Leidy, 1851), which represents a new nematomorph for the state. The only previously reported horsehair worm from Oklahoma is Gordius robustus Leidy, 1851, from Stillwater, Payne County. Paragordius varius is probably the most common and widespread gordiid species in the New World. It is now known from 25 (plus the District of Columbia) of the contiguous United States and three provinces of Canada and also has been reported from Hawaii and throughout South America. Collecting at several other sites in the eastern part of the state failed to recover additional P. varius.
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