Vodnik prapovodnik Sukatcheva et Vrsansky, gen. et sp. nov. is described from the Badenian volcano-sedimentary succession of the Plastovce Member, Sebechleby Formation in southern Slovakia. It represents a taxon closely related to the common European caddis-flies Chaetopterix Stephens, 1829 and Chaetopterna Martynov, 1913 of the family Limnephilidae Kolenati, 1848. In a seasonal climate, these partially psychrophilic insects emerge in masses during the autumn. Larvae are fixed to water and thus the seasonality in otherwise warm Badenian climate, with characteristic mangroves, might have been caused by temperature changes in streams and/or rivers coming from adjacent steep elevations.