Ischnura heterosticta

 
Common Name:
Common Bluetail
Odonata
Order:
Odonata
Suborder:
Anisoptera
Family:
Coenagrionidae
Genus:
Ischnura
Species:
I. heterosticta
Species Description
Ischnura heterosticta (Burmeister, 1842), one of at least two species with the common name Common Bluetail, is a common Australian damselfly of the family Coenagrionidae. It is the largest of the six Ischnura species in Australia. They are generally found near slow-running or still water. The species is also salt tolerant. It flies from October to March.

Ischnura heterosticta is a small damselfly. Males have body length around 34 mm, strikingly blue and black with a mostly dark, unringed abdomen except at its very base and the distinct blue tail tip. Distinct unbroken lateral blue markings on thorax, blue antehumeral stripe and two obvious postocular spots, one behind each eye. Eyes bicoloured: black above and blue below.

The females are the same size, have a variety of forms including green, brown, black, and a form with very similar colourings to the male. As with other species in this genus, elsewhere in the world, females have several colour morphs. So far, four types have been recorded: a green morph; brown morph; purplish morph; and a blue male-like 'andromorph'. All have a distinct antehumeral stripe and the distinct pale postocular spots. 

The species is most similar to A. watsoni but the latter is much smaller, with a green antehumeral stripe and lacks the postocular spots. 
 
 
 
 
 

References:
http://en.wikipedia.org/wiki/Ischnura_heterosticta
http://www.brisbaneinsects.com/brisbane_dragons/BlueTail.htm
http://www.ecology-solutions.com.au/vic_dragonflies/I_heterosticta.htm

 

 

 

The Species on Stamps
 
Mozambique
2011.01.30

 

 


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