1908  Clymenia crassicosta Wedekind: 616, pl.43 fig.1, 1a.
     1914  Platyclymenia crassicosta.-Wedekind: 41, pl.2 fig.2.
     1923  Platyclymenia crassicosta.-Schindewolf: 454.
     1929  Platyclymenia protacta var. crassicosta.-Lange: 113,
           text-fig.32, pl.3 fig.31.

Close to Trigonoclymenia protacta, but with broader ribbing close
to ventral side (teste Lange,1929). Horizon of holotype
unrecognized, Enkeberg (Wedekind, 1908).