E-Fauna BC: Electronic Atlas of the Wildlife of British Columbia

Aeshna eremita
Lake Darner
Family: Aeshnidae
Species account author: Robert Cannings.
Extracted from Introducing the Dragonflies of British Columbia and the Yukon (2002)

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Distribution of Aeshna eremita in British Columbia
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Species Information


Description

Large; looks much like the Canada Darner, except its face is yellow-green with a black line and it lacks spots under the abdomen. Thorax stripes are blue to green; shape shown in figure. Pale areas on females are usually green or yellow-green, but sometimes blue. Male’s upper appendages simple. Length: ♂ 75 mm, ♀ 73 mm.


Flight Period

B.C., mid June to late October; Yukon, late June to early September.

Genus Description


Mosaic Darners are common in B.C. and the Yukon; they fly everywhere dragonflies are found. All 11 B.C. species are large and can usually be distinguished by their variations on a basic colour pattern. Generally, the body is brown, and each side of the thorax has a pair of blue, green or yellow stripes – their shape is important in identification. Look also for the colour of the face and the line across its middle. Viewed from above, the forehead bears a distinctive T-shaped mark, called the “T-spot”. The abdominal spots on males are usually blue, and on females green, yellow or blue. Male upper appendages come in three types.

Biology

Family Description

Large, swift-flying dragonflies, usually marked with blue, green or yellow. Adults hunt tirelessly for insects over ponds, lakes and streams, and wander widely in search of prey. Most species rest in a vertical position, but a few sit flat on the ground. Females have a prominent ovipositor and lay eggs in water plants or floating wood above or below the water line. Larvae are slender and sleek, with flat labia lacking bristles; they are rapacious hunters among water plants. Recently, A. californica and A. multicolor have been transferred from Aeshna to Rhionaeschna.
Field Notes

The largest Mosaic Darner in Canada and one of the most often encountered dragonflies in the northern forests of North America. In southern B.C., it lives at all elevations, but is most common around forest lakes at mid and high elevations. Prefers lakeshores with little emergent vegetation; it also occurs in deep fens and bogs, and around lakes and ponds surrounded by sedges. It may fly early in the morning and in the evening when the temperature is cool and the light is low. It likes perching on tree trunks.

Distribution


Northern. Widespread in B.C. and in the forested valleys of the southern Yukon; in the northern Yukon, it lives only in the low-lying Porcupine River system.

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
COSEWIC
NativeS5YellowNot Listed
BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Additional Photo Sources

General References


Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2021. E-Fauna BC: Electronic Atlas of the Fauna of British Columbia [efauna.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2021-10-21 11:51:34 PM]
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