North America, Europe, Asia
Northern Europe, Russia/Siberia, Western Asia
Lakes, Ponds, sluggish streams and rivers
Mediterranean region, Rock outcrops, Woodlands
21,22
A1, A2, A3, 1a, 1b, 2a, 2b, 3a, 3b, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21