All three have open, gyroconic coiling, a subtriangular whorl section with a flattened dorsum.
The siphuncle in each is ventral with flared out, cyrochoanitic septal necks and internal, longitudinal blade-like actinosiphonate deposits.
Gonionaedyceras has a strongly curved cyrtoconic shell with an asymmetric subtriangular whorl section.
Gyronaedyceras has a compressed gyroconic shell of about two volutions with an assymmetrical, subtraingular whorl section having a broadly rounded to subangular venter and flat dorsum.
Naedyceras, most especially, outwardly resembles Stereotoceras, which in contrast has a depressed, wider than high, cross section and a beaded, nummuloidal siphuncle.