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

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

Photo of species

© Robert A. Cannings  Email the photographer   (Photo ID #1022)

E-Fauna BC Static Map
Distribution of Aeshna septentrionalis in British Columbia
Details about map content are available here.

Species Information


Description

Small, similar to the Zigzag Darner. Thorax stripes are pale blue or green; shape shown in figure. The face is blue or green; T-spot shown in figure. Male’s abdomen has more blue than the Zigzag Darner’s, the blue spots usually fused to form irregular stripes; upper appendages simple. Female has blue or yellow-green abdominal spots. Length: ♂ 60 mm, ♀ 57 mm.


Flight Period

B.C., mid July to mid September; Yukon, mid June to mid 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 most boreal of our darners. In the Yukon, it is the only dragonfly known to breed north of the British Mountains; uncommon in the southern valleys. Yukon records are from a variety of peatlands, marshes and ponds, many with floating aquatic mosses. In B.C., it lives in subalpine peatlands with ponds. Perches low on tree trunks, or on stones, logs or moss.

Distribution


Northern. Widespread in the Yukon. In B.C., it ranges south only in the mountains and on northern plateaus to about 51°N in the Coast and Rocky mountains.

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
COSEWIC
NativeS5?YellowNot 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: 2022-01-25 2:12:03 AM]
Disclaimer: The information contained in an E-Fauna BC atlas pages is derived from expert sources as cited (with permission) in each section. This information is scientifically based.  E-Fauna BC also acts as a portal to other sites via deep links.  As always, users should refer to the original sources for complete information.  E-Fauna BC is not responsible for the accuracy or completeness of the original information.


© E-Fauna BC 2021: An initiative of the Spatial Data Lab, Department of Geography, UBC