Bolboceratex posticatus (Boheman, 1860) (Fig. 5A–D)

Bolboceras posticatum Boheman 1860: 114; Gemminger & Harold 1869: 1079; Péringuey 1901: 489; Boucomont 1902: 5, 1912: 12; Paulian 1941: 35

Bolboceratex posticatus: Krikken 1984: 33; Gussmann & Scholtz 2000: 1115

Bolboceras inchoatum Péringuey 1901: 489; Boucomont 1912: 10; Gussmann & Scholtz 2000: 1116 (Fig. 5D–F)

Bolboceras petulans Kolbe 1907: 30; Péringuey 1908: 645; Boucomont 1912: 12; Paulian 1941: 35