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.