Canadian Journal of Arthropod Identification

The Taxonomy of the North American Species of Parameletus Bengtsson, 1908 (Ephemeroptera: Siphlonuridae), with Keys to Nymphs and Male Imagos

CJAI 33 -- November 1, 2017

Steven K. Burian

Department of Biology, Southern Connecticut State University, 501 Crescent St., New Haven, CT USA 06515 (

| Abstract | Introduction | Materials & Methods | Key to Parameletus species | Systematic Accounts | Acknowledgments | References | PDF | Cite | Appendix |



In North America, the Holarctic genus Parameletus Bengtsson is widely distributed across the northern tier of the continent and parts of the Rocky Mountains. Four species occur in North America (Parameletus chelifer, P. columbiae, P. croesus, and P. midas) with P. chelifer having the greatest range and currently the only species of Parameletus detected broadly across the subarctic of Canada. In this paper, new detailed comparative descriptions are provided for nymphs and imagos. The nymph of P. croesus is described for the first time. A final instar nymph of P. croesus was positively associated with the male imago stage based on the observation of diagnostic characters of the male imago through the cuticle of the last instar nymph. New illustrated keys to male imagos and late instar nymphs are presented. New distribution records are presented and geographic variation in diagnostic characters of species is discussed. New information on the aquatic habitats of nymphs and the biology of species is presented.

Parameletus midas (McDunnough) (photo by Steven Burian)