Calopterygidae -Broad-winged Damsels

Notes - Key -References

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Notes on the Michigan Larvae of Calopterygidae

Two genera of this primarily tropical familydamselflies are found in Michigan. Mature specimens usually are quitelarge, and the elongate first antennal segment (picture) and large premental cleft (picture) is clearly distinctive from all other damselflyfamilies. Common in streams and rivers, larvae are primarily foundalong banks with accumulations of leafy or woody debris or amongaquatic vegetation. Adults, noted for their rather large size andbeautiful colors, emerge in late spring (Calopteryx) and earlysummer (Hetaerina). Older literature refers to this family asAgrionidae.

Generic Key to Mature Larvae of MichiganCalopterygidae
Walker 1953, Westfall andTennessen 1996, Westfall and May1996)

1a. Prementumcleft long, nearly halfway to its base (picture1, picture2); posterolateral margins of abdominal segments 9 and 10without spines - Calopteryx

1b. Prementumcleft short, reaching only to base of palpal lobes (picture); posterolateral margins of abdominal segments 9 and 10with small, distinct spines (picture) - Hetaerina

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Walker, E. M. 1953.The Odonata of Canada and Alaska, Vol. 1. University of TorontoPress: Toronto, Ontario. xi + 292 pp.

Westfall, M.J., and M. L. May. 1996. Damselflies of North America. ScientificPublishers: Gainesville, Florida. x + 650 pp.

Westfall,M. J., and K. J. Tennessen. 1996. Odonata, pp. 164-211.In AnIntroduction to the Aquatic Insects of North America, 3rd Ed.Merritt, R. W. and K. W. Cummins (eds.). Kendell/ Hunt PublishingCompany: Dubuque, Iowa.

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