Epiaeschna Hagen, 1877
Epiaeschnaheros (Fabricus,1798) - SwampDarner

Fig. 1: Exuvia ofE. heros, scanned by M. O'Brien

Notes -References
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Page last updated: 03August 1998 (EB)

Notes onEpiaeschna heros in Michigan

A monotypic genus, E. heros (Figure 1, above)is one of the largest of North America's dragonflies. These largebrown larvae are encountered in ponds and lakes, often with muchaquatic vegetation. Walker (1958) found nymphs in a shaded pond a few yards inside a woodlot in Ontario, whereas Williamson(1903) collected larvae in Tennesseefrom ditches and marshes associated with chimney-building crayfish.Morphologically similar to Nasiaeschna in regards tothe mid-dorsal abdominal ridge, but differs from that monotypic genusin that the abdominal segments of E.heros lack mid-dorsal hooks. Adultsemerge from June through early July, and may fly in large swarms.Records of this species are known only from the LP (Map 1), althoughadults - which are strong flyers - probably also occur in theUP.

Map 1: County distribution ofEpiaeschnaheros in Michigan
Click on map for a larger image


Fabricius, J. C.1798. Supplementum entomologiae systematicae, pp. 283-285. Proft.(Schubothe), Hafniae.

Hagen, H. A. 1877.Synopsis of the Odonata of America. Proceedings of the Boston Society of NaturalHistory 18:86.

Walker, E. M. 1958.The Odonata of Canada and Alaska, Vol. 2. University of TorontoPress: Toronto. xii + 318.

Williamson, E. B.1903. The dragonflies (Odonata) of Tennessee, with a few records forVirginia and Alabama. EntomologicalNews 14:221-229.