- So what is the difference between Dragonflies and Damselflies?

This article written by Tracy Williams and found in the 2008 Winter Gecko Issue 36.
There was a water focus for the whole year.

Both Damselflies and Dragonflies are insects that have three stages in their lifecycle: Egg-Lavae-Adult. Part of the Order Odonata (or toothed ones) they are divided into 2 sub-orders of Anistoptera (Dragonflies) and Zygoptera (Damselflies).

The way to distinguish between the two is by:
Egg shape- Dragonfly eggs tend to be round whilst Damselfly eggs are usually long and cylindrical.
Nymph – Dragonfly nymphs are short and bulky with gills inside the abdomen or body, used to extract oxygen from water. Damselfly nymphs are long and narrow with three (sometimes two) feathery gills extending from the end of the abdomen.
Adult – in Dragonflies, the rear wing sets have a broader base and are larger than the front pair, both of which, in most species, are held out to either side of the body in flight and at rest. Damselflies have front and back wing sets of a similar shape which, in most species, fold back above the body when resting. Dragonflies hunt in warm weather whereas Damselflies are not as limited by temperature and will hunt in colder temperatures. Though both need fairly good water quality, Damselflies are reportedly less sensitive to pollution than Dragonflies. Damselflies copulate while perched, whilst Dragonflies do so in–flight.

Both are amazing aerodynamically. With wings positioned near their centre of balance, both Dragonflies and Damselflies are very strong fliers and are capable of amazing aerial manoeuvres. They easily fly straight up, hover, dart sideways, change directions in mid-flight, stop instantly, and fly backwards, whilst Dragonflies, because of their wing design, can accelerate to speeds as fast as 60km per hour.