DragonflyPix

Cordulegaster bidentata

• Scientific name: Cordulegaster bidentata Selys, 1843
• English name: Sombre Goldenring
• German name: Gestreifte Quelljungfer
• French name: Cordulégastre bidenté
• Dutch name: Zuidelijke bronlibel
• Swedish name: N/A
• Norwegian name: N/A
• Finnish name: N/A
• Danish name: N/A
• Italian name: Guardaruscello collinare
• Czech name: páskovec dvojzubý
• Slovenian name: Povirni studenčar
• Bulgarian name: Двузъбесто воденичарче
• Typical length: 69-78 mm
• Hindwing: 45-50 mm

Cordulegaster bidentata

Distribution map

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

One of seven European Goldenring species, the Sombre Goldenring is typically darker, a bit smaller and definitely rarer than the more common Cordulegaster boltonii. Cordulegaster bidentata is a Central and Southern European species with a patchy distribution as far South as Italy and Greece. Unlike its congeners Cordulegaster boltonii and C. trinacriae, C. bidentata is a very difficult species to photograph; it seems to be always on the move and only twice have we ever managed to photograph a male at rest. Update: As of July 2009, this situation has very much improved and we now have some wonderful photos of the species on display. [By way of a further update, in June 2011 we managed to photograph two immature males at rest; see below]. The species' main distinguishing features include the black (rather than yellow) occipital triangle, and the absence of the narrower golden rings on S5-S8. In all Goldenring species, the female lays her eggs by dipping her abdomen repeatedly in wet mud (or moss, etc.) in a pneumatic drill fashion. For an overview of the key differences between the species of the boltonii-complex and those of the bidentata-complex, hover your mouse pointer here.

Line DrawingLineDrawing: the male's abdomen in dorsal view, and the male's head, thorax and abdomen in lateral view.

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1 / 20; PhotoID: Dr666 19/07/2013 16:07 Italien F8 1/350 180mm ISO400 Canon7D -Crop -Flash MF
2 / 20; PhotoID: Dr695 16/06/2011 13:14 Österrike F8 1/80 180mm ISO400 Canon7D -Crop -Flash MF
3 / 20; PhotoID: Dr696 12/07/2014 15:08 Italien F8 1/250 180mm ISO800 Canon7D -Crop -Flash MF
4 / 20; PhotoID: Dr935 05/07/2016 17:47 Italien F8 1/400 180mm ISO200 Canon7D2 -Crop -Flash MF
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6 / 20; PhotoID: Dr1211 07/07/2016 18:06 Italien F8 1/250 180mm ISO200 Canon7D2 -Crop -Flash MF
7 / 20; PhotoID: Dr1212 09/07/2016 11:06 Italien F8 1/640 180mm ISO200 Canon7D2 -Crop -Flash MF
8 / 20; PhotoID: Dr1213 09/07/2016 11:55 Italien F8 1/250 180mm ISO200 Canon7D2 -Crop -Flash MF
9 / 20; PhotoID: Dr1214 10/07/2016 18:07 Italien F8 1/250 180mm ISO200 Canon7D2 -Crop -Flash MF
10 / 20; PhotoID: Dr1215 19/07/2016 16:40 Italien F8 1/250 180mm ISO200 Canon7D2 -Crop -Flash MF
11 / 20; PhotoID: Dr1216 26/06/2014 14:03 Österrike F8 1/125 180mm ISO400 Canon7D -Crop -Flash MF
12 / 20; PhotoID: Dr1217 10/07/2016 17:13 Italien F8 1/800 180mm ISO200 Canon7D2 -Crop -Flash MF
13 / 20; PhotoID: Dr1218 26/06/2017 17:01 Italien F8 1/500 180mm ISO200 Canon7D2 -Crop -Flash MF
14 / 20; PhotoID: Dr1219 27/07/2015 17:03 Italien F8 1/640 180mm ISO400 Canon7D2 -Crop -Flash MF
15 / 20; PhotoID: Dr1220 12/07/2012 15:40 Italien F8 1/800 180mm ISO400 Canon7D -Crop -Flash MF
16 / 20; PhotoID: Dr1221 08/07/2014 14:25 Italien F9.5 1/250 180mm ISO200 Canon7D -Crop -Flash MF
17 / 20; PhotoID: Dr1222 10/07/2016 16:24 Italien F8 1/500 180mm ISO200 Canon7D2 -Crop -Flash MF
18 / 20; PhotoID: Dr1223 19/07/2013 17:12 Italien F8 1/350 180mm ISO400 Canon7D -Crop -Flash MF
19 / 20; PhotoID: Dr1224 27/07/2015 17:09 Italien F8 1/200 180mm ISO200 Canon7D2 -Crop -Flash MF
20 / 20; PhotoID: Dr1225 08/07/2014 12:54 Italien F8 1/180 180mm ISO1600 Canon7D -Crop -Flash MF