1896
Obolus triangularis sp. n. — Mickwitz, pp. 145, fig. 2:7-9
1896
Obolus triangularis sp. nov. var. inornatus var. nov. — Mickwitz, pp. 148, fig. 2:10-12
1896
Obolus panderi sp. n. — Mickwitz, pp. 149, fig. 2:13
1989
Ungula inornata (Mickwitz) — Popov et Khazanovitch, pp. 121, fig. 6:1-4,14; 7:19,22-24
1993
Ungula inornata (Mickwitz, 1896) — Puura & Holmer, pp. 219, fig. 2G-J
1993
Ungula inornata (Mickwitz, 1896) — Puura & Holmer, pp. 219, fig. 2G-J
2003
Ungula inornata (Mickwitz, 1896) — Popov & Holmer, fig. 3B
2013
Ungula inornata (Mickwitz, 1896) — Lang & Puura, pp. 124, fig. 2,3