1900  Neoicoceras Hyatt in Zittel: 550.
     1903  Neoicoceras.- Smith: 143.
     1937  Neoicoceras.- Plummer & Scott: 179.
     1957  Gastrioceras.- Miller & Furnish: L61.
     1960  Neoicoceras.- Ruzhentsev: 249.
     1962  Neoicoceras.- Osnovy: 409.
     1966  Neoicoceras.- Furnish & Knapp: 300 [= nomen dubium].
     1975  Neoicoceras.- Nassichuk: 107.

Type species: Goniatites elkhornensis Miller & Gurley, 1896, p.37 [OD].

A:   Conch cross section low trapezoidal, umbilicus extremely wide.
G:   Suture like Eoasianites, but median saddle about half as high as entire ventral lobe.

[One species, one specimen].

[Holotype fragmental not showing shell ornamentation. Genus may be related to Somoholites or early schistoceratids. For discussion see FURNISH & KNAPP, 1966, p.300].

The conch of Neoicoceras is rather narrow and highly evolute; typically, the width is slightly more than half the diameter and the umbilicus approximates 70 per cent of the conch diameter at maturity. The shell is smooth except for faint transverse lamellae: It must be stressed that the umbilical region of the holotype of the type species is devoid of nodes but that this part of the specimen is worn. The suture has 8 lobes; the first lateral saddle is nearly symmetrical and is about the same width as the first lateral lobe (Nassichuk, 1975).