Among the specimens that I received from my friend Nils, during our recent fossil exchange, are these Goniatites named Cheiloceras sp. They come from the Nehnden Formation near Brilon, Germany. The Nehnden Formation is Fammenian in age which puts it at the very end of the Devonian.
From what I can find, there are about 4 different species of Cheiloceras found in the region around Brilon with seven subspecies. This is based on a search of the Goniat online site.
Thank you, Nils, for the specimens!