Notes on the dragonfly fauna of very small pools near Münster, Westfalia, German Federal Republic

The odonate fauna of small meadow pools was recorded for several years. Even the permanent pools cenoses are relatively poor; Lestidae are completely lacking. Pyrrhosoma nymphula and Erythromma najas dominate in clean waters, whereas Ischnura elegans withstands a certain degree of pollution. Adult Anisoptera are absent, save for Anax imperator, which established territories even at the smallest bodies of water.