Jan Hamrsky / Clubtail dragonfly nymph (Gomphidae) crawling on sunken wood, Europe, May, controlled conditions

Heather Angel / Golden flange tail dragonfly (Sinictinogomphus clavatus) male perching on Lotus stem. Puzhehei Lake, Puzhehei National Wetland Park, Yunnan Province, China.

Jan Hamrsky / Clubtail dragonfly nymph (Gomphus vulgatissimus), burrowing into the sand at bottom, Europe, June, controlled conditions

Jan Hamrsky / Clubtail dragonfly nymph (Gomphus vulgatissimus), underwater, Europe, June, controlled conditions

Jan Hamrsky / Clubtail dragonfly nymph (Gomphus vulgatissimus), underwater, Europe, June, controlled conditions

Jussi Murtosaari / Green snaketail dragonfly (Ophiogomphus cecilia), male, Finland, August.

Jussi Murtosaari / Green snaketail dragonfly (Ophiogomphus cecilia), male jaws open, Finland, August.

Andres M. Dominguez / Western clubtail dragonfly (Gomphus pulchellus), Sierra de Grazalema Natural Park, southern Spain. June.

Andres M. Dominguez / Western clubtail dragonfly (Gomphus pulchellus), Sierra de Grazalema Natural Park, southern Spain. June.

Jim Brandenburg / Clubtail Dragonfly (Gomphidae), Minnesota

John Abbott / Flag-tailed spinyleg dragonfly (Dromogomphus spoliatus) female, Texas, USA, June.

John Abbott / Cobra clubtail dragonfly (Gomphus vastus) male, Texas, USA, July.

John Abbott / Cobra clubtail dragonfly (Gomphus vastus) female, Texas, USA, July.

John Abbott / Cobra clubtail dragonfly (Gomphus vastus) male, Palmetto State Park, Texas, USA, July.

John Abbott / Cobra clubtail dragonfly (Gomphus vastus) male, Texas, USA, July.

MYN / Dirk Funhoff / Green Snaketail (Ophiogomphus cecilia) on branch, Hassloch, Rhineland-Palatinate, Germany, August. meetyourneighbours.net project

John Abbott / Graygreen Clubtail (Arigomphus pallidus) female resting on ground, Pee Dee River, Horry County, South Carolina, USA, May.

John Abbott / Graygreen Clubtail (Arigomphus pallidus) male, Punch Bowl Landing, Pee Dee River, Horry County, South Carolina, USA, May.

John Abbott / Common Sanddragon (Progomphus obscurus) male just emerged from exuviae, Little Pee Dee River, Horry County, South Carolina, USA, May.

John Abbott / Clearlake Clubtail (Gomphus australis) male resting on ground, Cheraw State Park, Cheraw, Chesterfield County, South Carolina, USA, May.

John Abbott / Blackwater Clubtail (Gomphus dilatatus) male, Conway, Horry County, South Carolina, USA, May.

Bernard Castelein / Western clubtail (Gomphus pulchellus) female, Groot Schietveld, Wuustwezel, Belgium, May.

Bernard Castelein / Western clubtail (Gomphus pulchellus) close up of female, Groot Schietveld, Wuustwezel, Belgium, May.

Jussi Murtosaari / Common Club-tail (Gomphus vulgatissimus) male, eastern Finland, June.

Jussi Murtosaari / Green Snaketail (Ophiogomphus cecilia) in flight, Joutsa (formerly Leivonmaki), Finland, August.

Jussi Murtosaari / Small Pincertail / Green-eyed Hook-tailed Dragonfly (Onychogomphus forcipatus) female, Joutsa (formerly Leivonmaki), Finland, June.

Jan Hamrsky / Clubtail dragonfly nymph (Gomphidae) burrowing itself into the sand, Europe, May, controlled conditions

Jan Hamrsky / Clubtail dragonfly nymph (Gomphidae), crawling on sunken wood, Europe, May, controlled conditions

Jan Hamrsky / Clubtail dragonfly nymph (Gomphidae), walking on stones at the bottom, Europe, May, controlled conditions

Jan Hamrsky / Clubtail dragonfly nymph (Gomphidae) hiding in leaves at the bottom, Europe, May, controlled conditions

Jan Hamrsky / Clubtail dragonfly nymph (Gomphidae) hiding in leaves at the bottom, Europe, May, controlled conditions

Wild Wonders of Europe / Möllers / Male Yellow clubtail dragonfly (Gomphus simillimus) resting on stone, Allier river, Pont-du-Chateau, Auvergne, France, August 2010

John Abbott / Gulf Coast clubtail dragonfly (Gomphus modestus) male resting with tail in the air, Louisiana, USA, June

John Abbott / Black-shouldered spinyleg dragonfly (Dromogomphus spinosus) male at rest, San Jacinto, Texas, USA, June

John Abbott / Ashy clubtail dragonfly (Gomphus lividus) pair mating, Angelina National Forest, Jasper, Texas, USA, March

John Abbott / Gulf Coast clubtail dragonfly (Gomphus modestus) male resting with tail in the air, Louisiana, USA, June

John Abbott / Banner club tailed dragonfly (Gomphus apomyius) male resting, Indian Creek, Jasper County, Texas, USA, April

John Abbott / Common sanddragon dragonfly (Progomphus obscurus) male at rest, Louisiana, USA, June

John Abbott / Oklahoma Clubtail dragonfly (Gomphus oklahomensis) male at rest, Sam Houston National Forest, Texas, USA, April

Nature Production / Great Clubtail dragonfly (Sieboldius albardae) female, Japan

Nature Production / Dragonfly (Stylogomphus suzukii) male, Japan

Nature Production / Golden Flangetail dragonfly (Sinictinogomphus clavatus) male, Japan

Nature Production / Dragonfly (Trigomphus melampus) male, Japan

Thomas Marent / Club-tailed Dragonfly (Gomphus vulgatissimus), Switzerland

Michael Durham / Pacific Clubtail (Gomphus kurilis) dragonfly, photographed with a high-speed camera, coastal mountains, Oregon

Konrad Wothe / Yellow-legged Clubtail (Gomphus pulchellus) dragonflies mating, Upper Bavaria, Germany

Konrad Wothe / Yellow-legged Clubtail (Gomphus pulchellus) male dragonfly, Upper Bavaria, Germany

Konrad Wothe / Yellow-legged Clubtail (Gomphus pulchellus) male dragonfly, Upper Bavaria, Germany

Thomas Marent / Green Club-tailed Dragonfly (Ophiogomphus cecilia) female, Switzerland

Jussi Murtosaari / Green naketail dragonfly (Ophiogomphus cecilia) male resting on leaf. Leivonmaki National Park, Finland. June.

Jussi Murtosaari / Small pincertail dragonfly (Onychogomphus forcipatus) male resting on leaf. Leivonmaki National Park, Finland. June.

Jussi Murtosaari / Common clubtail dragonfly (Gomphus vulgatissimus) female resting on seedhead. Onkisalo, Finland. June.

Jussi Murtosaari / Common clubtail dragonfly (Gomphus vulgatissimus) female resting on seedhead. Onkisalo, Finland. June.