1878  Ceratites tropitus Abich: 13, pl.2 fig.3, pl.11 fig.21.
     1890  Otoceras (?) tropitum.-Karpinsky: 89.
     1891  Otoceras (?) tropitum.-Waagen: 215.
     1890  Otoceras tropitum.-Diener: 151.
     1900  Otoceras tropitum.-Arthaber in Frech & Athaber: 240,
       ----   Otoceras trochoides.-Arthaber in Frech & Arthaber: 241, pl.19 fig.1-3.
     1959  Prototoceras tropitum.-Ruzhentsev: 62, fig.1b,2b.
cf. 1969  Prototoceras cf. tropitum.-Taraz: 691.

Fig. TAX4549 C (suture), TAX5132 3 (ventral view), TAX5132a c (suture).