1937  Welleritidae Plummer & Scott: 375.
     1960  Welleritidae.-Ruzhentsev: 223.
     1962  Welleritidae.-Osnovy: 387.
     1975  Welleritidae.-Nassichuk: 152.
     1981  Aqishanocerataceae Wang: 472,
     1981  Aqishanoceratidae Wang: 472.

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).

Famil yWelleritidae Plummer & Scott, 1937:

[Welleritidae PLUMMER & SCOTT, 1937, p.375]. [=
Aqishanocerataceae WANG, 1981, p.472; = Aqishanoceratidae WANG,
1981, p.472].

A:   Conch form discoidal, moderately evolute to involute, with
moderately narrow umbilicus. Triangular coiling of inner whorls
in some forms.
B:   Ornamentation consisting of biconvex striae or densely
spaced riblets forming ventral sinus, commonly reticulate.
G:   In the course of phylogeny additional suture elements in
ventrolateral and umbilical areas.