or also Black-lined Skimmer - Orthetrum cancellatum ( -Großer Blaupfeil in german)
Thanks to Johan for the determination on this! I thought it to be the Keeled Skimmer ;)
Length - not wingspan: 44-49mm
Females and immatures are pale, yellowish brown with tho bold lines running along the length of the abdomen. The wings have a yellow costa and a very dark brown or black pterostigma.
The males develop a blue pruinescence on the abdomen darkening to the rear with with 8-10th segment becoming black. Its eyes are very dark green. They fly swift and low, skimming the water surface.
Females retain their colour and markings though they become quite greyish brown with age.
This dragonfly is found at any open water with bare patches along the shore where the patrolling males frequently rest in the sun, like seen above.
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