Abstract. Kirkbyites upsoni Johnson, 1936 from the Upper Pennsylvanian of North America, type species of the poorly understood genus Kirkbyites, corresponds significantly with the well-known species Kullmannissites? solus Becker, 1981 from the Upper Devonian of SW Europe. From common, important diagnostic characters, the latter is considered to be a species of Kirkbyites Johnson, 1936 which is a valid genus of the Family Amphissitidae Knight, 1928 (Ostracoda, Palaeocopida, Kirkbyacea).