1940  Eothalassoceras Miller & Furnish: 105.
     1950  Eothalassoceras.- Miller & Downs: 207.
     1957  Eothalassoceras.- Treatise: L69.
     1960  Eothalassoceras.- Ruzhentsev: 206.
     1962  Eothalassoceras.- Osnovy: 370.
     2002  Eothalassoceras.-Leonova: S41.

Type species: Prothalassoceras inexpectans Miller & Owen,1937, p.418 [OD].

G:   Serration irregular, asymmetrical, shallow, and restricted to the bases of the lobes. Median saddle as high as first lateral
saddle.

[Similar to Aristoceras Ruzhentsev, 1940, maybe its senior synoym - generic name Aristoceras is established later than
Eothalassoceras (teste Miller & Downs, 1950, p.207)].