The Nymph and Male of Centroptilum Infrequens MCD (Baetidae)

Abstract

Centroptilum infrequens was described from a single female specimen taken at Winnipeg Beach, Manitoba. This description was based on colour and size characteristics which we have found to be variable. The species was rediscovered along the Manitoba escarpment. The male imago is described for the first time. Wings, genitalia, legs, body segments and the overall morphology are illustrated and taxonomically evaluated. The female imago is redescribed using structural characteristics. The nymph is also described for the first time. Mouth parts, antennae, wing pads, legs, paraprocts, and colour pattern are illustrated and evaluated. C. infrequens belongs to the C. pennulatum Eaton species group.