Small, similar to the Azure Darner, but its thorax stripes are yellow to blue, and the hind one is more zigzagged and less T-shaped; the facial T-spot has a crescent-shaped base. Male’s abdomen has large blue spots, though smaller than the Azure Darner’s. The face is yellow to green. Female’s abdominal spots are blue or yellow-green. Male’s upper appendages simple. Length: ♂ 59 mm, ♀ 56 mm.
B.C., late June to early October; Yukon, late June to late August.
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.
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.
Restricted to specific peatland conditions, where it can be abundant: bogs or fens where the surface is mossy and sparsely vegetated with short, evenly spaced sedges, and where open water, if present at all, is reduced to small, shallow, mud- or moss-bottomed ponds and puddles. Adults perch on the ground, rocks and logs, or vertically, low on tree trunks.
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:
2022-06-26 12:51:10 PM]
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