DragonflyPix

Pohjanukonkorento (Aeshna caerulea)

• Scientific name: Aeshna caerulea (Ström, 1783)
• English name: Azure Hawker
• German name: Alpen-Mosaikjungfer
• French name: Aeschne azurée
• Dutch name: Azuurglazenmaker
• Swedish name: Fjällmosaikslända
• Norwegian name: Fjelløyenstikker
• Finnish name: Pohjanukonkorento
• Danish name: N/A
• Italian name: Dragone azzurro
• Czech name: šídlo horské
• Slovenian name: Šotna deva
• Bulgarian name: N/A
• Typical length: 54-64 mm
• Hindwing: 37-41 mm

Pohjanukonkorento (Aeshna caerulea)

Distribution map

Map data based on J.-P. Boudot & V. J. Kalkman (eds.),
Atlas of the European Dragonflies and Damselflies

The Azure Hawker is a relatively small aeshnid, similar in size to the Blue-Eyed and Migrant Hawkers (Aeshna affinis and A. mixta). Its thorax is essentially brown, with short and weakly-developed antehumeral stripes, while the spots on its abdomen are a bright blue in the male and usually yellow in the female. Aeshna caerulea occurs at high latitudes (in Scandinavia and Northern Scotland) or, in Central Europe, at high altitudes (in the Alps and Dolomites). To survive in such cold conditions it has the typical habit of basking on bright and flat surfaces, by pressing its body against e.g. the bark of a birch tree. Failing that, e.g. above the tree line in the Alps, its preferred perch is a sun-exposed rock (or a photographer's light-coloured trousers - see photograph Dr1244 below). The species also has the capacity - maybe more than any other European dragonfly species - of regulating its body heat by changing the colour of its abdominal spots. When it's warm and sunny, those spots are typically light blue in the male; when it's cloudy and cold, the spots are a much darker, duller, chocolate brown colour. Dark colours absorb more light than light colours, and light-absorption helps to generate body heat. See photograph Dr1243 below for an example.

Line DrawingLineDrawing: the male's appendages in dorsal and in lateral view.

Click on a thumbnail to display the photograph (at 1200 x 800 pixels) in a new window.

1 / 20; PhotoID: Dr939 15/07/2017 09:27 Suomi F8 1/250 180mm ISO200 Canon7D2 -Crop -Flash MF
2 / 20; PhotoID: Dr940 15/07/2017 09:30 Suomi F8 1/320 180mm ISO400 Canon7D2 -Crop -Flash MF
3 / 20; PhotoID: Dr941 26/07/2011 17:02 Suomi F8 1/100 180mm ISO400 Canon7D -Crop -Flash MF
4 / 20; PhotoID: Dr942 16/08/2008 17:10 Italia F8 1/500 180mm ISO200 Canon40D -Crop -Flash MF
5 / 20; PhotoID: Dr1240 15/07/2017 12:09 Suomi F8 1/160 180mm ISO400 Canon7D2 -Crop -Flash MF
6 / 20; PhotoID: Dr1241 25/07/2012 09:59 Suomi F8 1/500 180mm ISO200 Canon7D -Crop -Flash MF
7 / 20; PhotoID: Dr1242 12/08/2012 13:18 Italia F8 1/160 180mm ISO400 Canon7D -Crop -Flash MF
8 / 20; PhotoID: Dr1243 18/07/2012 12:17 Suomi F8 1/100 180mm ISO200 Canon7D -Crop -Flash MF
9 / 20; PhotoID: Dr1244 07/08/2009 15:22 Italia F5.6 1/1600 180mm ISO200 Canon50D -Crop -Flash MF
10 / 20; PhotoID: Dr1447 27/07/2011 17:21 Suomi F8 1/125 180mm ISO400 Canon7D -Crop -Flash MF
11 / 20; PhotoID: Dr1448 15/07/2017 12:16 Suomi F8 1/200 180mm ISO400 Canon7D2 -Crop -Flash MF
12 / 20; PhotoID: Dr1449 27/07/2013 17:38 Suomi F8 1/500 180mm ISO400 Canon7D -Crop -Flash MF
13 / 20; PhotoID: Dr1450 27/07/2013 17:42 Suomi F8 1/500 180mm ISO400 Canon7D -Crop -Flash MF
14 / 20; PhotoID: Dr1451 29/07/2013 15:36 Suomi F8 1/500 180mm ISO400 Canon7D -Crop -Flash MF
15 / 20; PhotoID: Dr1452 31/07/2011 16:28 Suomi F8 1/500 180mm ISO200 Canon7D -Crop -Flash MF
16 / 20; PhotoID: Dr1596 15/07/2017 16:56 Suomi F8 1/160 180mm ISO200 Canon7D2 -Crop -Flash MF
17 / 20; PhotoID: Dr1597 23/07/2012 14:02 Suomi F8 1/800 180mm ISO400 Canon7D -Crop -Flash MF
18 / 20; PhotoID: Dr1598 17/07/2017 09:08 Suomi F8 1/160 180mm ISO200 Canon7D2 -Crop -Flash MF
19 / 20; PhotoID: Dr1599 31/07/2011 18:03 Suomi F8 1/320 180mm ISO200 Canon7D -Crop -Flash MF
20 / 20; PhotoID: Dr1600 17/07/2017 09:29 Suomi F8 1/1000 180mm ISO200 Canon7D2 -Crop -Flash MF