Species: Coenagrion angulatum Walker

Biology: Can be very abundant in semipermanent and permanent ponds. This species overwinters as larvae under the ice. In good conditions the larvae can tolerate being frozen in ice. The adult emergence period begins in late May and is essentially over by the end of June. Peak emergence occurred in mid June (Parker 1992). Females lay their eggs into submerged vegetation and hatch soon after. The need for water to overwinter eliminates this species from temporary ponds with a winter dry phase.

References:

Parker, D.W. 1992. Emergence phenologies and patterns of aquatic insects inhabiting a prairie pond. Ph.D. Thesis, Dept. of Biology, University of Saskatchewan, Saskatoon, SK.

Sawchyn, W.W. and C. Gillott. 1975. The biology of two related species of coenagrionid dragonflies in western Canada. Can. Ent. 107:1119-128.

Westfall, M.J. Jr. and M. L. May. 1996. Damselflies of North America. Scientific Publishers, Washington.