Dorocordulia Needham,1901(Corduliidae) - Emeralds
Dorocordulia libera(Selys, 1871) - Racket-tailed Emerald

Notes -References
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Page last updated: 13August 1998 (EB)

Notes on Dorocordulia libera in Michigan

The two species in this genus are found inEastern North America, one of which reaches Michigan and is ratherwidespread in the state (Map 1).

Map 1: Countydistribution of Dorocordulialibera in Michigan
Click on map for a larger image

These small larvae can be found insphagnum-bordered bog ponds, bog-lined lakes and marshy bays(Walker andCorbet 1975). Needham and Westfall(1955) write that larvae "inhabit edgesof water commonly under overhanging turf and clamber up projectingroots and stumps to transform." Exuviae are usually left on stems orstumps less than a foot above the water (Walker and Corbet1975). Larvae resemble those ofSomatochlora and Cordulia, but thecombination of a broad, longitudinal thoracic stripe and abominalhooks differentiates Dorocordulia larvae fromthose of the other two genera.


Needham, J. G. 1901.Aquatic insects in the Adirondacks. Bulletin of the New York State Museum 47:381-612, 30 pl.

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

Selys-Longchamps, M.E. de. 1871. Synopsis des Cordulines. Bulletin de l'Académie royale des Sciences deBelgique (2)31:238-316;519-565.

Walker, E. M.,and J. S. Corbet. 1975. The Odonata of Canada and Alaska, Vol. 3.University of Toronto Press: Toronto, Ontario. xvi + 308.