Argia
emma
(Emma's Dancer)
Description:
Naiad-This
is a small, but robust naiad ¾ inch (20 to 21 mm) long. The coloration is light
brown with dark brown markings.
Adult-This
is a medium-sized damselfly 1 ¼ to 1 ½ inches (33 to 39 mm) long. The males
are a bright violet color, and are the only damselflies with this color in our
area. The females are variable in
color. They can be creamy white to dark brown in color, or olive, or slate blue.
They have a pair of black spots on the upper side of segment two.
Range:
This species is found in
eastern British Columbia and Alberta south to Nebraska, Nevada, and California.
In Idaho it is found throughout the state.
Habitat:
This damselfly is found
at streams and rivers, or along lake shores near inlet or outlet streams.
Adult Flight Season:
June 23 to August
12
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. They will also pick small insects such as aphids
from plants.
Ecology:
This species is abundant
along streams flowing through sagebrush desert. The naiads live under rocks
in riffles or under debris in pools.
Reproduction:
After males and females
mate, the female Emma's Dancer oviposits in tandem in submerged tree roots in
streams. The females crawl backward down the roots until their abdomen is submerged.
The male remains attached by grasping behind the female's head with his anal
appendages.
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 Unpublished M. S. thesis.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.