Tetanops myopina Fallén, 1820 (Diptera: Ulidiidae) is recorded from the Czech Republic for the first time, based on specimens found in the sandpit Závada near Hlučín (grid mapping code 6074). Because T. myopina is generally a maritime species, living on costal sand dunes of the Irish, North and Baltic Seas and partly the Atlantic Ocean (Ireland and Wales only), this surprising record is treated in detail with a description of the microhabitat and a discussion of the biology and biogeography of the species and the historical origin of this inland population