The Uddenitinae, proposed by Miller and Furnish, and known from the Pennsylvanian (U Carb) and Lower Permian, are transitional between the ancestral Pronoritidae and the more traditional medlicottiids.

Sutures are goniatitic to ceratitic with rounded saddles and slightly pointed to digitate lobes which form a declining series going toward the umbilicus.

Prouddenites, named by Miller, 1930, which is found in the Pennsylvanian of the south-central United States and the Urals, has a discoidal shell with a flattened venter and a suture with an unequally trifid first lateral lobe.

Uddenites, named by Böse, 1919, known from the Upper Pennsylvanian of Texas and the Urals, has a discoidal shell with a retuse (grooved) venter.

Uddenoceras, named by Miller and Furnish, 1954, from the Upper Pennsylvanian of Texas and the Urals has a discoidal shell like Uddenites, but the ventro-lateral portion of the suture forms a broad saddle.