Bivalvia | ... | Unionidae | Unioninae | Unionini | Oxynaiina | Rhombuniopsis prona
Martens, 1874. Zeit. Deutsch. Geol. Gesell. 26: 744, pl. 20, figs. 6-7.
= Paraptychorhynchus pronus (Martens, 1874) — Starobogatov, 1970: 285.
= Unio pronus v. Martens — Lindholm, 1932: 17, pl. 1, fig. 25, pl. 3, fig. 7.