DragonflyPix

Onychogomphus uncatus

• Scientific name: Onychogomphus uncatus (Charpentier, 1840)
• English name: Large Pincertail
• German name: Grosse Zangenlibelle
• French name: Gomphe à crochets
• Dutch name: Grote tanglibel
• Swedish name: N/A
• Norwegian name: N/A
• Finnish name: N/A
• Danish name: N/A
• Italian name: Gonfo pinzato
• Czech name: N/A
• Slovenian name: Rumeni peščenec
• Bulgarian name: N/A
• Typical length: 50-53 mm
• Hindwing: 29-33 mm

Onychogomphus uncatus

Distribution map

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

The Large Pincertail is indeed marginally bigger than its stable mate the Small Pincertail (Onychogomphus forcipatus). In terms of distribution, Onychogomphus uncatus is very much the rarer and more localized species; it only occurs in the Western-Mediterranean countries, and even there it's usually outnumbered by O. forcipatus. In fact, in three years of searching, we've only managed to find one stream nearby where O. uncatus is the more numerous of the two and where it occurs in good numbers. The species' most distinguishing features include its bright-blue eyes (as opposed to O. forcipatus' grey-to-green eyes), and the relatively wide, parallel black stripes on the side of the thorax. Structurally more important (but difficult to observe in the field unless you get a very detailed close-up view) is the presence or absence of a so-called subterminal knob on the male's lower appendage. Male O. forcipatus have such a knob; male O. uncatus don't.

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

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

1 / 20; PhotoID: Dr117 17/07/2009 15:08 Italia F8 1/400 180mm ISO100 Canon50D -Crop -Flash MF
2 / 20; PhotoID: Dr118 17/07/2009 15:27 Italia F8 1/250 180mm ISO100 Canon50D -Crop -Flash MF
3 / 20; PhotoID: Dr160 03/07/2014 14:54 Italia F9.5 1/250 180mm ISO200 Canon7D -Crop -Flash MF
4 / 20; PhotoID: Dr161 21/07/2009 17:06 Espanja F8 1/80 180mm ISO100 Canon50D -Crop -Flash MF
5 / 20; PhotoID: Dr403 13/06/2015 16:39 Espanja F8 1/400 180mm ISO400 Canon7D2 -Crop -Flash MF
6 / 20; PhotoID: Dr404 13/08/2013 13:34 Italia F8 1/90 180mm ISO200 Canon7D -Crop -Flash MF
7 / 20; PhotoID: Dr407 24/07/2015 11:54 Italia F8 1/250 180mm ISO200 Canon7D2 -Crop -Flash MF
8 / 20; PhotoID: Dr408 24/07/2009 18:01 Espanja F5.6 1/320 180mm ISO100 Canon50D -Crop -Flash MF
9 / 20; PhotoID: Dr409 04/07/2017 11:12 Italia F8 1/400 180mm ISO200 Canon7D2 -Crop -Flash MF
10 / 20; PhotoID: Dr410 25/06/2011 12:31 Italia F8 1/500 180mm ISO200 Canon7D -Crop -Flash MF
11 / 20; PhotoID: Dr411 25/06/2011 13:10 Italia F8 1/800 180mm ISO200 Canon7D -Crop -Flash MF
12 / 20; PhotoID: Dr412 25/06/2011 14:16 Italia F8 1/320 180mm ISO200 Canon7D -Crop -Flash MF
13 / 20; PhotoID: Dr413 09/06/2015 15:23 Espanja F8 1/250 180mm ISO400 Canon7D2 -Crop -Flash MF
14 / 20; PhotoID: Dr414 26/07/2009 18:17 Espanja F8 1/250 180mm ISO100 Canon50D -Crop -Flash MF
15 / 20; PhotoID: Dr415 04/07/2017 11:24 Italia F8 1/500 180mm ISO200 Canon7D2 -Crop -Flash MF
16 / 20; PhotoID: Dr416 12/06/2011 14:05 Italia F8 1/200 180mm ISO200 Canon7D -Crop -Flash MF
17 / 20; PhotoID: Dr417 13/08/2013 11:44 Italia F8 1/250 180mm ISO200 Canon7D -Crop -Flash MF
18 / 20; PhotoID: Dr433 26/08/2013 13:18 Italia F11 1/250 180mm ISO200 Canon7D -Crop -Flash MF
19 / 20; PhotoID: Dr434 23/07/2015 16:11 Italia F8 1/60 180mm ISO400 Canon7D2 -Crop -Flash MF
20 / 20; PhotoID: Dr435 24/07/2009 18:13 Espanja F5.6 1/250 180mm ISO100 Canon50D -Crop -Flash MF