1940  Epithalassoceras Miller & Furnish: 105.
     1944  Epithalassoceras.-Miller in King et al.: 95.
     1957  Epithalassoceras.- Treatise: L69.
     1960  Epithalassoceras.- Ruzhentsev: 206.
     1962  Epithalassoceras.- Osnovy: 370.
     1971  Epithalasspceras.-Beinert: 176 (unpublished).
     2002  Epithalassoceras.-Leonova: S41.

Type species: Epithallassoceras ruzencevi Miller & Furnish, 1940, p. 107 [OD].

A:   Conch form thick-discoidal, with small umbilicus.
G:   Suture-line like Thalassoceras, but external lobes even more strongly denticulate: external suture is dissected nearly
to the tops of the saddles by deep digits. Median saddle about half the height of entire ventral lobe. First lateral lobe as wide as each prong of the ventral lobe. Internal umbilical lobe bifid.