Common Hooktail, Paragomphus genei, Gewone Hakiestert
Short Description:
Common Hooktail, Paragomphus genei, Gewone Hakiestert, is medium-sized, with green head and thorax, and yellow and dark brown abdomen with reddish brown club, that frequents wet, gravel
beaches of savanna rivers.
Previously in South African literature called Green Hooktail. Worldwide it is called Green Hooktail.
Family Gomphidae (Rambur, 1842)
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Key identification features:
- Face is mostly light green. Labrum, anteclypeus, postclypeus and entire frons is bright green with some brown smudging. Head brown with spots above, green at back.
- Eyes are dark greenish brown.
- Thorax is bright green with two smudgy dark brown stripes. Dorsal thorax makings are green with well smudged greenish brown stripes (indistinct). Dorsal thorax pattern faded brown markings The thorax dark brownish markings are sharp, clearly delimiting pale postdorsal and antehumeral stripes.
- Wings clear to slightly greenish smoky. Pterostigmas black with central light brow/green stripes, 3 mm long.
- Abdomen segments 1 - 3 is green, blackish brown and a little yellow. S 2 has may have a greenish "U" shaped pattern in lateral view. This may very with age and must be used with caution as identification aid. . S 1 - 7 with yellow and blackish brown partial rings. First ¾ of segment 7 is bright yellow, hind ¼ dark brown. S 8 - 10 is dark brown with some faint yellow blotches, giving a reddish appearance. Foliations on S 8 large relative to s 9, light brown with dark edges. S 9 longer than s10. In dorsal view s 8 - 9 have light brown patterns that may darken with age. S 10 in dorsal view has two (2) (almost blended into one (1) small yellow dots either side of the dorsal carina
- Superior appendages conspicuously yellowish, fairly long, curved. Superior twice as long as inferior. Inferior appendages curved upwards, blackish.
- Similar to male but the body markings is less distinctive
- May have blue in the lower eye.
- Dorsal thorax pattern is green with indistinct faded brown stripes (contrary to male markings).
- Wings Smokey. Pterostigmas black with central light brow/green stripes, 3 mm long
- Abdomen is stout. S 2 has narrow anchor shape (crescent shaped) pattern in lateral view. This is Diagnostic for this species female. S 7 hind opproximate 1/3 dark brown, front yellow. Foliations virtually absent. Upper claspers thin, yellow becoming dark towards the tip.
Habitat:
- Moist, gravel or sandy shores of savanna rivers, occasionally on the exposed shores of pools and dams, and temporary waters. One of the few Gomphidae that is able to complete larval development in less than a year (about two months). It is assumed to be multivoltine (more than one broods per year). The species often has enormous larval populations of up to 100 individuals per square meter in perennial sections of ephemeral rivers. But also large populations e.g., in lower Orange and lower Kunene River.
Behaviour:
- Perches with its abdomen raised at a slight angle at the water’s edge, darts off rapidly but returns again to the shore.
Compared with other species:
Comparison Chart
- Click Here for a detailed comparison chart for the 5 Hooktail species seen in southern Africa
- This is a great tool using macro images to compare the differences in the species by using close-up images
- Due to the size of the file we rather leave a link for you to follow
Differences
- Common Hooktail, Paragomphus genei may co-habitat with Corkscrew Hooktail, Paragomphus elpidius. These two species are difficult to differentiate in the field.
Males
- Cerci (claspers) on Corkscrew Hooktail,Paragomphus elpidius thicker (less slender), apex blunt, without or with one tooth, without distinct ventral ridge. Epiproct (lower appendage) is about 1/3 as long as cerci and not curving upwards. Tips of Cerci (upper claspers) tend to curve in towards S 10.
- Cerci on Common Hooktail, P. genei have dark tips. Thorax has dark brownish markings that is sharp. clearly delimiting pale postdorsal and antehumeral stripes. Rear thorax strip in Corkscrew Hooktail,Paragomphus elpidius forms a "Y" shape fork towards the front thorax stripe.
- Brownish postdorsal and antihumeral stripes on P. genei tend to be undefined almost smudged.
- S 7 on Corcscrew Hooktail, P. elpidius is yellow in first half and brown in second. On P. genei s 7 is bright yellow, first 2/3, ending in well-defined pattern with dark brown hind 1/3. Brown lateral stripe (diagnostic). Segment 7 is bright yellow, first 1/2, ending in well-defined pattern with dark brown hind half.
- P. genei has small club (s 8 large with s 9 small). Rock Hooktail Paragomphus cognatus small yellow with dark lower edge. Corkscrew Hooktail, P. elpidius has very large club and foliages.
- P. genei S 10 has distinctive yellow spot around the dorsal carina.
Females
- In lateral view dorsal thorax pattern of Common Hooktail, P genei has faded brown stripes compared with the well-defined stripes of Corcscrew Hooktail P. elpidius.
- S 2 on P. genei has a clear narrow anchor shape marking. P. elpidius. a "C "pattern with the inside of the "C" brown touching s 1. Rock Hookrail, P. cognatis has a square yellow/green pattern with a brown square inside pattern that ma open to s 3.
- S 10 on P. elpidius same lengths as s 9 but much shorter on P. genei.
- P..genei has small club (s 7 large with s 8 almost non-existent)
Learn more about other species - Hooktails
Distribution:
South Africa:
- Recorded from the Western Cape and the Eastern Cape, but abundant records from KZN, MP, GP and LP
Africa:
- Algeria; Angola; Benin; Botswana; Burkina Faso; Côte d'Ivoire; Cameroon; Central African Republic; Chad; Democratic Republic of the Congo; Ethiopia; Ghana; Kenya; Liberia; Malawi; Mali; Morocco; Mozambique; Namibia; Nigeria; Republic of South Africa; Sierra Leone; Socotra (Yemen); Somalia; Sudan; Tanzania; Togo; Tunisia; Uganda; Zambia; Zimbabwe
Further reading:
Websites
- A Visual Guide to the Damselflies and Dragonflies of South Africa
Odonata Atlas of Africa VMU Number 6665790
The IUCN red list of Threatened Species - African Dragonflies & Damselflies Online