1929  Schistoceratidae Schmidt: 75.
     1937  Bendoceratidae.- Plummer & Scott.
     1950  Schistoceratidae.- Ruzhentsev: 118.
     1952  Schistoceratidae.- Ruzhentsev: 913.
     1957  Schistoceratidae.- Treatise: L65.
     1960  Schistoceratidae.- Ruzhentsev: 219.
     1962  Schistoceratidae.- Osnovy: 382.
     1965  Schistoceratidae.- Nassichuk & Furnish: 724.
     1975  Schistoceratidae.- Nassichuk: 138.

Superfamily Schistocerataceae Schmidt, 1929:

A:   Conch form discoidal to thick-discoidal; evolute, usually with wide umbilicus, to moderately involute, with narrow
umbilicus. Triangular coiling of early whorls common in some groups.
B:   Shell surface smooth, or reticulate; growth lines sinuous, with ventral sinus.
C:   Early whorls may exhibit riblike nodes on umbilical shoulder, extending to biconvex growth striae.
G:   Suture-line like Gastricocerataceae, but with the following tendencies in the course of phylogeny: (1) median
saddle becoming as high as entire ventral lobe; (2) ventral lobe becoming wide, in some forms giving rise to additional
sutural elements or subelements (Welleritidae); (3) umbilical portion of suture (between [Germ.] L and U, [Russ.] U
and I, in some genera giving rise to additional sutural elements: [Germ.] (E1EmE1)AL:UI --> (E1EmE1)ALU2:U1I --> E1EmE1ALU2vU2mU2dU1I, [Russ.] (V1V1)LU:ID --> (V1V1)LU1:U2ID --> (V1V1)LU1U2.2U2.1:U2.2ID
(Schistoceratidae, Welleritidae, Christioceratidae); (4) trifurcation of lobes (Schistoceratidae, Christioceratidae).

Family Schistoceratidae Schmidt,1929:

A:   Triangular coiling of early whorls common.
B:   Ornamentation of shell surface reticulate; at young stage with riblike nodes on umbilical shoulder.
G:   In the course of phylogeny umbilical portion of suture expanding and giving rise to additional sutural elements by
addition of a second umbilical lobe (U2) and finally its trifurcation [Germ.] (U2vU2mU2d), [Russ.] U2.2U2.1:U2.2.
Sutural development [Germ.] (E1EmE1)AL:UI --> E1EmE1ALU2vU2m:U2dU1I, [Russ.] (V1V1)LU:ID --> (V1V1)LU1U2.2U2.1:U2.2ID.