[ O. joannae Goljan, 1953]

Comments: The described from the north-western Poland species is known in all adjacent countries: Sweden, Norway, Denmark (Silfverberg 2010), and Lithuania (Tamutis et al. 2011). The heliophilous in north-western Poland (Byk 2012) and coprophagous species, whose findings in the Kaliningrad Region are very possible. The beetle generally prefers more humid climate than O. ovatus, but both close related species can co-occur in one biotope (Rössner 1992).