1884  Schistoceras Hyatt: 336.
pars 1903  Schistoceras.- Smith: 104.
     1914  Schistoceras.- Wedekind: 14.
     1915  Paralegoceras.- Haniel: 58.
pars 1917  Schistoceras.- Böse: 92.
     1918  Schistoceras.- Wedekind: 161.
     1929  Schistoceras.- Schmidt: 75.
     1937  Schistoceras.- Plummer & Scott: 200,
     1937  Metaschistoceras Plummer & Scott: 255.
     1939  Schistoceras.- Librovitch: 138.
     1940  Schistoceras.- Miller & Furnish: 537.
     1942  Schistoceras.- Miller & Unklesbay: 149.
     1950  Schistoceras.- Miller & Downs: 206.
     1950  Schistoceras.- Ruzhentsev: 124.
     1950  Schistoceras.- Miller & Downs: 206.
     1957  Schistoceras.- Treatise: L65.
     1960  Schistoceras.- Ruzhentsev: 219.
     1962  Schistoceras.- Osnovy: 383.
     1997  Schistoceras.- Mapes et al.: 213.

Type species: Goniatites missouriensis Miller & Faber, 1892, p.
164, = Schistoceras hyatti Smith, 1903, p.108.

Schistoceras HYATT, 1884, p.336 [*S. hyatti SMITH, 1903, p.108, =
Goniatites missouriensis MILLER & FABER, 1892, p.164 (subj., fide
MILLER & FURNISH, 1940, p.538), SD by SMITH, 1903, p.104]. [=
Metaschistoceras  PLUMMER & SCOTT, 1937, p.255, type M.
heilprini, p.256 (subj.); for discussion see MILLER & FURNISH,
1940, p.538].

A:   Conch form moderately evolute to involute, with narrow
umbilicus at maturity.
B,F: Growth striae biconvex; longitudinal lirae present, but
reticulate ornamentation inconspicuous. Shell surface smooth,
without nodes.
G:   Median saddle almost as high as first lateral saddle; second
umbilical lobe trifurcate, its portions being completely
separate. Sutural formula [Germ.] E1EmE1ALU2vU2m:U2dU1I,
                          [Russ.] (V1V1)LU1U2.2U2.1:U2.2ID.

[Mapes et al., 1997, p.213: Characterized by lack of triangular
coiling in earlier whorls; umbilical nodes expressed only during
juvenile stages of ontogeny (D = 12 to 24 mm). Sutural elements
U2.2, U2.1 and U2.2 migrate at diameters of 10 to 15 mm.]