Gomphidae

The Gomphidae are a family of dragonflies commonly referred to as clubtails or club-tailed dragonflies. The family contains about 90 genera and 900 species found across North and South America, Europe, Asia, Australia, and Africa. The name refers to the club-like widening of the end of the abdomen (abdominal segments 7 through 9). However, this club is usually less pronounced in females and is entirely absent in some species.

Etymology
The name may be derived from Latin gomphus or gond meaning "hinge".

Characteristics
Clubtails have small, widely separated compound eyes, a trait they share with the Petaluridae and with damselflies. The eyes are blue, turquoise, or green. The thorax in most species is pale with dark stripes, and the pattern of the stripes is often diagnostic. They lack the bright metallic colors of many dragonfly groups and are mostly cryptically colored to avoid detection and little difference between the sexes is seen. Adults are usually from 40 to 70 mm in length; there are 6 specific variations that are native to Africa alone, and vary from 33 to 40 mm in length; there are also 97 varieties specific to North America as well.

Clubtails are fast-flying dragonflies with short flight seasons. They spend much time at rest, perching in a suitable position to dart forth to prey on flying insects. They tend to perch on the ground or on leaves with the abdomen sloping up and its tip curling down a little. Larger species may perch with a drooping abdomen or lie flat on a leaf. Another stance adopted by clubtails perching in the open is "obelisking", standing with the abdomen raised vertically, a posture adopted otherwise only by the skimmers.

Most clubtails breed in streams, rivers, or lakes. The nymphs are unusual in having a flat mentum, part of the mouthparts, and their antennae have only four segments. They burrow in the sediment at the bottom of the water body, with the nymphs of the dragonhunter (Hagenius brevistylus) living among damp bark and leaf litter at the edge of the water. Some larvae variations actually differ from this typical burrowing. Some will only come out during daytime, which differs from the predominant nighttime emergence. Some larvae also will lay on flat surfaces, whereas most larvae prefer a vertical-type surface.

Genera
These genera belong to the family Gomphidae.


 * Acrogomphus Laidlaw, 1925
 * Agriogomphus Selys, 1869
 * Amphigomphus Chao, 1954
 * Anisogomphus Selys, 1858
 * Anomalophlebia Belle, 1995
 * Anormogomphus Selys, 1854
 * Antipodogomphus Fraser, 1951
 * Aphylla Selys, 1854
 * Archaeogomphus Williamson, 1919
 * Arigomphus Needham, 1897
 * Armagomphus Carle, 1986
 * Asiagomphus Asahina, 1985
 * Austrogomphus Selys, 1854
 * Brasiliogomphus Belle, 1995
 * Burmagomphus Williamson, 1907
 * Cacoides Cowley, 1934
 * Ceratogomphus Selys, 1854
 * Cinitogomphus Pinhey, 1964
 * Cornigomphus Martin, 1907
 * Crenigomphus Selys, 1892
 * Cyanogomphus Selys, 1873
 * Cyclogomphus Selys, 1854
 * Davidioides Fraser, 1924
 * Davidius Selys, 1878
 * Desmogomphus Williamson, 1920
 * Diaphlebia Selys, 1854
 * Diastatomma Burmeister, 1839
 * Dromogomphus Selys, 1854
 * Dubitogomphus Fraser, 1940
 * Ebegomphus Needham, 1944
 * Eogomphus Needham, 1941
 * Epigomphus Hagen in Selys, 1854
 * Erpetogomphus Selys, 1858
 * Euthygomphus Kosterin, 2016
 * Fukienogomphus Chao, 1954
 * Gastrogomphus Needham, 1941
 * Gomphidia Selys, 1854
 * Gomphidictinus Fraser, 1942
 * Gomphoides Selys, 1854
 * Gomphurus Needham, 1901
 * Gomphus Leach in Brewester, 1815
 * Hagenius Selys, 1854
 * Heliogomphus Laidlaw, 1922
 * Hemigomphus Selys, 1854
 * Hylogomphus Needham, Westfall & May, 2000
 * Ictinogomphus Cowley, 1934
 * Idiogomphoides Belle, 1984
 * Isomma Selys, 1892
 * Labrogomphus Needham, 1931
 * Lamelligomphus Fraser, 1922
 * Lanthus Needham, 1897
 * Leptogomphus Selys, 1878
 * Lestinogomphus Martin, 1911
 * Lindenia de Haan, 1826
 * Macrogomphus Selys, 1858
 * Malgassogomphus Cammaerts, 1987
 * Mastigogomphus Cammaerts, 2004
 * Megalogomphus Campion, 1923
 * Melanocacus Belle, 1986
 * Melligomphus Chao, 1990
 * Merogomphus Martin, 1904
 * Microgomphus Selys, 1858
 * Mitragomphus Needham, 1944
 * Neogomphus Selys, 1858
 * Nepogomphoides Fraser, 1934
 * Nepogomphus Fraser, 1934
 * Neurogomphus Karsch, 1890
 * Nihonogomphus Oguma, 1926
 * Notogomphus Selys, 1858
 * Nychogomphus Carle, 1986
 * Octogomphus Selys, 1873
 * Odontogomphus Watson, 1991
 * Onychogomphus Selys, 1854
 * Ophiogomphus Selys, 1854
 * Orientogomphus Chao & Xu, 1987
 * Paragomphus Cowley, 1934
 * Perigomphus Belle, 1972
 * Perissogomphus Laidlaw, 1922
 * Peruviogomphus Klots, 1944
 * Phaenandrogomphus Lieftinck, 1964
 * Phanogomphus Carle, 1986
 * Phyllocycla Calvert, 1948
 * Phyllogomphoides Belle, 1970
 * Phyllogomphus Selys, 1854
 * Platygomphus Selys, 1854
 * Praeviogomphus Belle, 1995
 * Progomphus Selys, 1854
 * Scalmogomphus Chao, 1990
 * Shaogomphus Chao, 1984
 * Sieboldius Selys, 1854
 * Sinictinogomphus Fraser, 1939
 * Sinogomphus May, 1935
 * Stenogomphurus Carle, 1986
 * Stylogomphus Fraser, 1922
 * Stylurus Needham, 1897
 * Tibiagomphus Belle, 1992
 * Tragogomphus Sjöstedt, 1899
 * Trigomphus Bartenev, 1911
 * Zonophora Selys, 1854

Fossil genera

 * †Auroradraco Archibald and Cannings 2019 Kamloops Group, Canada, Ypresian
 * †Gunterbechya Huang et al. 2019 Burmese amber, Cenomanian
 * †Nannogomphus Handlirsch 1906