1923  Protoxyclymenia Schindewolf: 63.
     1929  Protoxyclymenia.-Lange: 120.
     1957  Protoxyclymenia.-Treatise: L44.
     1960  Protoxyclymenia.-Ruzhentsev: 244.
     1962  Protoxyclymenia.-Osnovy: 408.
     1987  Protoxyclymenia.-Korn & Price: 13.
     1989  Eokosmoceras Czarnocki: 70.
     2002  Protoxyclymenia.-Korn & Klug: 250.
     2005  Protoxyclymenia.-Nikolaeva & Bogoslovskii: 144.

A:   Conch form discoidal, widely umbilicate, with highly oval whorl section.
B:   Weakly to strongly biconvex growth lines, often bunched to form ribs, especially near to the umbilicus.
G:   Suture with broad ventral saddle and a very shallow adventitious lobe; the asymmetrical lobe rounded,
       the dorsal lobe deep and pointed.

       [Eokosmoceras differs in minor details of growth lines, regarded herein as of specific significance only].