Calopteryx (Agrion) aequibilis
(River Jewelwing)


Order: Odonata
Suborder: Zygoptera
Order Description:
Damselflies
Family: Calopterygidae (Agriidae)
Family Description: Jewelwing

Description:
   Naiad-This is a long, slender naiad, or immature damselfly, about 1 ½ inches (35 - 40 mm) long. It also has very long legs. It is light brown with dark markings.
   Adult-This is a large damselfly about 1 ¾ to 2 ¼ inches long (45 to 52 mm). The build is robust, especially in the females. The color is an unmistakable iridescent green or blue. The outer third of the wing is black.

Range:
This damselfly is found from southern British Columbia to Nova Scotia and south to New Jersey, Colorado, and Washington. In Idaho it is found at streams and rivers in the lower elevation areas of the state.

Habitat:
This species is found at streams and rivers.

Adult Flight Season:
June 18 to September8

Diet:
   Naiad-Naiads eat a wide variety of aquatic insects, including mosquito larvae, mayfly larvae, and other aquatic fly larvae.
   Adult-Adults eat a wide variety of small soft-bodied flying insects, such as mosquitoes, mayflies, flies and small moths.

Ecology:
This damselfly is found along large streams and rivers. The naiads live in underwater tree roots and aquatic vegetation.

Reproduction:
The River Jewelwing is the only dragonfly or damselfly species from our area in which the males actually court the females. A male will flutter back and forth in front of a perched female to attract her attention. After mating, the female backs down the stem of an aquatic plant until she is a foot or more underwater, and lays her eggs in the stem of the plant. She then floats or swims to the surface and flies away. The eggs hatch in 18 to 30 days and the naiads take 2 to 3 years to mature.

Conservation:
Populations are widespread, abundant, and secure.
Status: Unprotected nongame species
Global Rank: G5
State Rank: S?

References:
Corbet, P. S. 1999. Dragonflies: Behavior and Ecology of Odonata. Cornell University Press, Ithaca, New York, USA, 829pp.

Logan, E. R. 1967. The Odonata of Idaho. Unpublished M. S. thesis. University of Idaho, Moscow, Idaho, USA, 105 pp.

Needham, J. G. and M. J. Westfall. 1955. Dragonflies of North America. University of California Press, Berkely, California, USA, 615 pp.

Paulson, D. R. 1999. Dragonflies of Washington. Seattle Audubon Society, Seattle, Washington, USA, 32 pp.

Walker, E. M. and P. S. Corbet. 1975. The Odonata of Canada and Alaska, Vol. III. University of Toronto Press, Toronto, Ontario, Canada, 307 pp.


Written by Mark Lung and Stefan Sommer, 2001
Photos by Dennis Paulson, 2001
Design by Ean Harker, 2001.

HTML by Marty Peck, 2001.