1874  Goniatites postcarbonarius Karpinskii: 291, pl.12
           fig.6-8.
     1889  Pronorites postcarbonarius var. tetragonus Karpinskiy:
           14.
     1890  Pronorites postcarbonarius var. tetragonus.-
           Karpinskiy: 23.
     1921  Pronorites postcarbonarius var. tetragonus: Frederiks:
           81.
     1939  Pronorites postcarbonarius var. tetragonus.-
           Chernov: 162, pl.41 fig.2, textfig.40.
     1945  Pronorites postcarbonarius var. tetragonus.-
           Karpinskiy: 46 [reprint].
     1951  Sakmarites postcarbonarius tetragonus.-Ruzhentsev:
           81, pl.3 fig.5,6.