 "Nicrosaurus" and "Mystriosuchus" have both been recovered in the first and second Stubensandstein in arkosic sandstones separated by floodplain mudstones and were both buried during flooding events in a freshwater river habitat.Both genera appeared at around the same time in central Europe.Additionally, because "Nicrosaurus" has also been found lacustrine sandstones, aerially exposed planes with breccia and reworked palaeosols, a terrestrial and swamp-inhabiting lifestyle seems probable.