Brachytron pratense

 
Common Name:
Hairy Hawker
Odonata
Order:
Odonata
Suborder:
Anisoptera
Family:
Aeshnidae
Genus:
Brachytron
Species:
B. pratense
The Name
Brachytron pratense (Muller, 1764), the only species in the genus Brachytron which is a monophyletic genus of European dragonfly of the family Aeshnidae containing the Hairy Dragonfly (Brachytron pratense), also known as the Hairy Hawker.

Could potentially be confused with other Hawker dragonflies, but its early flight season and relatively small size are good clues to its identity. The Hairy Dragonfly is the first of the large dragonflies to emerge each year.
 
 
 
 

 

The Characteristics
The Hairy Dragonfly is named for its hairy thorax, distinguishing it from other hawkers. It has a long, narrow pterostigma (the coloured, chitinous patch on the outer region of each wing). The antehumeral stripes are usually thin and green. The Hairy Dragonfly has coupled, oval-shaped spots on each abdominal segment and a long, thin pterostigma. The male is dark in appearence and the spots on the abdomen are blue. It has green ante-humeral stripes. The female has yellow markings and much shorter ante-humeral stripes. Length around 55mm, It is smaller than other species in the genus Aeshna. It is the United Kingdom's smallest hawker.

Like typical hawkers, the Hairy Dragonfly preys in mid-air on flying insects. It then carries its food to a suitable perch where it is able to eat and digest.

Mainly found near unpolluted, well-vegetated water bodies. Preferred environment: mesotrophic to eutrophic pools and small lakes and fens, also along slow flowing rivers, canals and disused flooded gravel pits. Avoids oligotrophic and highly eutrophic sites. The Hairy Dragonfly lives in ponds, lakes, fens, ditches, and canals rich in vegetation. Some plants that grow there include the common club rush, common reed, great fen sedge, and true bulrush. This dragonfly requires open and sunny areas with dense vegetation for protection. Here they are able to feed on flying insects, shelter, and grow sexually mature.

Although it is a common species, it is susceptible to uncongenial ditch management and poor water conditions. The is the reason the species disappeared for a few years, only to return recently. More so then its other relatives, the Hairy Dragonfly will only fly in sunshine and will hastily retreat if the sun happens to go in.
 
 
 

 

The Reproduction and Development
The Hairy Dragonfly's flight period is short and early, beginning in mid-May and ending in mid-July. Dead vegetation and living stems growing in the water, close to the water's edge, provide a home for the eggs. Two years later, larvae emerge by scaling plant stems just above the surface of the water or possibly crawling inland for about a meter where they have room to spread their wings.

Adults males are territorial and patrol breeding sites low down amongst vegetation searching for females. Females oviposit alone in dead or living plant material. Larvae hatch after a few weeks. Live amongst plant debris. Larval development normally takes 2 years but can occur faster in warmer conditions. Larvae normally emerge in early morning on plant stems usually close to ground.

Ovipositing in decomposing floating rushes and sedges of canals, large ditches, dykes, and ponds where the water is stagnant or has a feeble flow.
 
 
 
 

 

The Distribution
Found in Europe east to the Caucasus and the Caspian Sea. Rare in southern Europe (though found in northern Italy and Greece), and not found beyond the southern parts of Norway, Sweden, or Finland.
 
 

 

The Protection Status
Common
 

References:
http://en.wikipedia.org/wiki/Hairy_Dragonfly
http://www.habitas.org.uk/dragonflyireland/5622.htm
The Species on Stamps
   
Bulgaria
2005.06.29
   

 
 
 
 
 

 


 
        
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