Paleocadmus is a genus of radula known only from the Mazon Creek biota. It is only known from isolated fossils around a centimetre in length, and a few mm wide (in one instance associated with a possible beak), but its morphology aligns it with the nautiloids, or perhaps the bactritoids or belemnoids.^[1]

Paleocadmus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea (?)
Genus:	†PaleocadmusSolen & Richardson, 1975 Species P. herdinae Solen & Richardson, 1975 P. pohli Saunders & Richardson, 1979 References edit ^ Saunders, W. B.; Richardson, E. S. (1979). "Middle Pennsylvanian (Desmoinesean) Cephalopoda of the Mazon Creek fauna, northeastern Illinois". In Nitecki, M. H. (ed.). Mazon Creek fossils. pp. 333–359.