1988  Sygambritidae Korn: 138.
     2006  Goniatitidae.-Korn & Tilsley: 145. [Sygambritidae not accepted].

Superfamily Goniatitaceae:

A:   Conch form discoidal to globular, rarely oxycone; moderately involute, usually with narrow umbilicus.
B:   Ornamentation in general inconspicuous, except for longitudinal (spiral) ornamentation.
G:   Basic sutural formula (Family Goniatitidae): [Germ.] (E1EmE1)ALUI, [Russ.] (V1V1)LU:ID]); increase of sutural
       elements by trifurcation of branches of ventral lobe as well as of adventitious lobe (Delepinoceratidae), or by
       trifurcation of adventitious lobe only (Agathiceratidae).

Family Sygambritidae:

A-B: Conch form and ornamentation like Goniatitidae.
G:   Prongs of ventral lobe narrow and almost parallel-sided. Ventrolateral saddle narrowly rounded to subacute.
       Adventitious lobe symmetrical and bell-shaped.