A. longipes(Fig. 1) recently has been added to Michigan's Odonata list(Kielb andO'Brien 1997), with a thrivingpopulation found in several experimental, fishless ponds at theUniversity of Michigan's E. S. George Reserve in Livingston County,southeastern Michigan (Map 2). Among our largest odonate larvae,mature nymphs exceed 60 mm in total length. Emergence from this siteappears to occur from mid-June through early August (Figure2).
A. junius is acommon resident of small and large lentic habitats throughoutMichigan where fish predation is not a significant factor. I havealso found them in very slow-moving waters with ample aquaticvegetation in slow-moving stream waters. Apparently two populationswith different emergence periods exist in the northern part of itsrange (Trottier1966,
Other links with information on the biology orecology of larval Anax
none found as of 20 January 1998
1. Totallength of mature nymph >60 mm; folded labium passes metacoxatowards first abdominal segment (Fig. 2); labial lobes clearlytruncated (Fig. 3) - A.longipes
1a.Totallength of mature nymph <55 mm; folded labium clearly does notreach beyond metacoxa (Fig. 4); distal edge of labial lobes somewhatrounded (Fig. 5) - A.junius
Drury, D. 1773.Illustrations of natural history. Vol. 2. White: London. 90pp.
Hagen, H. A. 1861.Synopsis of the Neuroptera of North America, with a list of the SouthAmerican species. SmithsonianMiscellaneous Collections4:1-347.
Kielb, M. A.,and M. F. O'Brien. 1997. Discovery of an isolated population ofAnax longipes
Leach, W. E. 1815.Entomology, pp. 52-172.
Needham, J.G., and H. B. Heywood. 1929. A Handbook of the Dragonflies of NorthAmerica (Anisoptera). C. C. Thomas: Springfield, Illinois. 378pp.
Needham, J.G., and M. J. Westfall. 1955. A Manual of the Dragonflies of NorthAmerica (Anisoptera). University of California Press: Berkeley,California. x + 615 pp.
Trottier, R. 1966.The emergence and sex ratio of Anaxjunius Drury (Odonata: Aeshnidae) inCanada. The CanadianEntomologist 98:794-798.
Trottier, R. 1971.Effect of temperature on the life-cycle of