Wikipedia
Uddenitinae
The Uddenitinae a subfamily of the Medlicottiidae, a family of ammonoid cephalopods included in the Prolecanitida. 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