|
|
Emerald damselfly
 |
|
| [Note Guidelines] Photographer's Note |
Lestes sponsa, is a damselfly, with a wide Palaeartic distribution. It is known commonly as the Emerald Damselfly or Common Spreadwing. Both males and females have a metallic green colour and when resting its wings are usually half opened.
One of the larger damselflies, this species is most common in July and August. It is often found by ponds and lakes, and is very rarely seen along flowing water. Emerald Damselflies like to perch among reeds, their colour providing good camouflage. They are not as strong fliers when compared to other common damselflies such as the Common Blue or Large Red Damselflies, but they are more likely to be seen on misty, rainy days then those species. When disturbed they usually do not fly very far away, landing on another perch a few yards away. Their habit of perching with their wings half open is characteristic of the family Lestidae and gives rise to their other common name of spreadwings. A population can consist of several hundred insects.
L. sponsa mate in the usual dragonfly manner and will form tandem pairs away from water. Copulation lasts from 30-60 minutes and after mating they stay paired for egg-laying. The female lays eggs in submerged vegetation and whilst egg-laying the female can remain submerged for 30 min. The female pierces the tissue of aquatic plants and inserts her eggs. The eggs start to develop and will continue to develop for the next few weeks. Then due to changing environmental conditions the development of the eggs slows down. In this state of slow development, called diapause the eggs overwinter. L. sponsa is an obligatorly univoltine species.
The prolarva stage hatches from the egg in spring. This is a specialised short lived stage often lasting only minutes. The prolarva has no limbs and cannot feed but it can move by jumping or wriggling and if a prolarva is not in water when it hatches it will move about until water is found. Once in water the prolarva molt to the second stadia stage. The larvae are active and actively hunt prey leading to rapid larval growth. The larvae molt from one stadia to the next until growth is complete; in dragonflies the larval stages are the only stages where growth occurs. The number of stadia is not fixed and in good conditions the last larval stage, called F-0 can be reached in as little as 8 weeks.
The adults emerge in July and are on the wing until September. Adults are not sexually mature when they emerge and need a week or more, depending on conditions, before they can breed. In L.sponsa in Japan the length of the summer maturation period is correlated with temperature and lasts on average 20 days in the north where it is cooler up to 120 days in the hotter south. This stops egg laying early in summer, which could lead to egg not entering diapause and hatching in autumn. This would disrupt the normal cycle as larva hatched in autume would not survive the winter.
Lestes sponsa showing characteristic wings half-open pose
All species in the genus Lestes are very similar and are hard to separate in the field. The shapes of the anal appendages are characteristic. In L. sponsa the anal appendage is black with the superior appendage (which are the ones on the outside) with two internal teeth. The inferior appendage is elongated and cylindrical. In northern Europe five species of Lestes occur whilst in Europe as a whole there are six species, so identification can be problematical and it is best to look at as many features as possible.
L. sponsa is a typical member of the genus with a green metallic body and wings held away from the body at rest. The abdomen is 26-33mm long and the wings are 19-23mm long. Mature males have a powder blue colour on the prothorax and on segments 1-2 and 9-10 of the abdomen. Mature males have blue eyes. Females lacks the blue colour. Immature males also lack the blue pruinescence and have greeny brown eyes. The pterostigma of immature males are almost white. |
nglen, Juyona, Mikolaj, boreocypriensis, flashpoint, matatur, marius-secan, sandpiper2 has marked this note useful
Only registered TrekNature members may rate photo notes. |
|
|
| Discussions |
| None | | You must be logged in to start a discussion. |
|
- batu
![Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1079 W: 293 N: 4497]](https://i1.treknature.com/misc/g-g-g.gif)
(16383) - [2009-11-23 12:08]
-
Hello Hans,
very fine colours which fit very well to the sharply presented delicate damselfly.
In combination with composition and background design you produced an attractive picture.
Best wishes, Peter
-
- nglen
![Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 2883 W: 30 N: 9683]](https://i1.treknature.com/misc/g-s-g.gif)
(36145) - [2009-11-23 12:20]
-
Hi Hans. The Emerald damselfly looks so delicate . I like very much the colours of its body. Which you have taken so well against the plain BG. Its large eyes stand out. well taken all with intersting notes. TFS.
Nick..
-
- Juyona
![Gold Star Critiquer/Silver Workshop Editor [C: 2232 W: 10 N: 2971]](https://i1.treknature.com/misc/g-s-n.gif)
(16891) - [2009-11-23 12:20]
-
Hola amigo,
estupenda definición,
gran calidad y finos colores,
saludos
Hello Hans! Perfect macro, amazing sharp and focus. Ideal exposure. Good shot. Well done!
Hi Hans,
Absolutely outstanding macro capture of an Emerald damselfly perched on a tiny flower's tip from lateral POV with great DOF and fine composition.
TFS and have a nice night!
Cheers,
Bayram
hello Hans!
fantastic macro of female Lestes sponsa
perfect focused and great details
of this elegant damselfly
greetings sERGIO
-
- Mello
(2419)
- [2009-11-23 12:42]
-
Perfect capture of this Emerald damselfly Hans. Very well done in every details. Thanks for post.
Francisco
A good specimen in a fine composition with lively colours, seen from a detail revealing POV Hans, TFS indeed my friend.
Cheers,
Mehmet
Hello Hans,
Amazing details and colours.
Perfect composition, backgound and excellent focus.
Marius.
-
- nagraj
(15166)
- [2009-11-24 1:22]
-
Hi,
Very beautiful capture, fine details and colors. Perfect background too. tfs.
nagraj.v
Hi Hans
Good shot of this damselfly. Good POV, sharpness, details, dOF and composition.
Chris
-
- zetu
(16941)
- [2009-11-24 11:30]
-
Hello Hans
Perfect macro with clear image, natural colors and great details
Regards
Razvan
![Gold Star Critiquer [C: 1109 W: 0 N: 90]](https://i1.treknature.com/misc/g-n-n.gif)
(4452)![Gold Star Critiquer/Gold Note Writer [C: 2007 W: 0 N: 5412]](https://i1.treknature.com/misc/g-n-g.gif)
(29598)