phyllopdes (I'm not sure wether it's a Daphnia) are quite common and we've all seen the big and impressive second antennae. But the smaller first ones are less obvious and I studied them for the first time I must confess. Their endings look a bit like x-rayed fingers. In fact they're called aesthetascs and are sensory organs.:
Oblique light:
brightfield
Bernhard
P.S. edit: I've just learned from Mr. Kreutz that this should be Simocephalus vetulus.
