Hagenius Selys,1854 -Dragonhunter
Hagenius brevistylus Selys,1854 - Dragonhunter


Fig. 1: Hagenius brevistylus
Notes - References
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Page last updated: 24 June1998

Notes onHagenius brevistylus in Michigan

A monotypic genus, Hagenius brevistylus ismost certainly Michigan's most distinctively shaped odonate larva(Fig. 1). The very flat abdomen is broad, nearly circular in outline,bearing dark mid-dorsal hooks and sharp lateral angles on abdominalsegments 2-9. This shape is shared by other gomphid genera in otherparts of the world and appears related to the habit of burrowing inleafy trash (Corbet1962). Both Needham and Westfall(1955) and Walker (1958) provide an excellent description of the larva.


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

This species is widely distributed in Michigan(Map 1). Larvae are shallow sprawling predators, concealed withinloose substrates overlain with leafy or woody debris in streams andprotected areas of lakes and marshes environments. Aquatic samplesfrequently result in several size classes of larvae, which takeupwards to 4 years to mature, in Michigan emerging from the thirdweek of June to early July (Walker 1958, and pers. obs.). This species appears to be foundthroughout the state.

Other links with information on the biology orecology of larval Hagenius:
no links found as of 15 January 1998

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References

Corbet, P. S. 1962. Abiology of dragonflies. E. W. Classey Ltd.: Oxon, England.

Needham, J.G. and M. J. Westfall, Jr. 1955. A Manual of the Dragonflies of NorthAmerica (Anisoptera). University of California Press: Berkeley,California. 615 pp.

Selys-Longschamps, E.de. 1854. Synopsis des Gomphines. Bulletin de l'Académie royale des Sciences deBelgique 21(2):23-112(sep.3-93).

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

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