| Actual Image
Bring Me His Head (for Gert & Jaap) (50)
PDP
![Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2964 W: 366 N: 3848]](http://i1.treknature.com/misc/g-g-g.gif) (11751) | Here is one of the last Common Darters I have seen this year. It's a male and with there being no sun out I tried to get detailed picture of it's head showing the arrangement of cells in the compound eyes.
The eyes of dragonflies are amongst the largest among insects. With the eyes surrounding the head dragongflies can see forwards, upwards, side to side and behind all at the same time. The image they see is an apposition image, a series of apposed points of different light intensity. Insects can often see into the near UV and dome can also detect polarised light.
It is also possible to see an occeli (a single lens eye) above the frons next to the compoind eye. Dragonflies along with many other insects have three of these eyes. They are not able to see images but detect changes in light intensity. The nerves of these simple eyes are attached directly to the flight muscles to enable corrections to be made to flight conditions.
This is dedicated to Gert and Jaap who have decided to leave TN, I will miss you both.
I hope you like it. I have posted a Neat Image version as a WS, it gets rid of the noise but loses some details also. |
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