1857
Orthoceras laevigatum sp. nov. non Orthoceras laevigatum (McCoy, 1844) — Boll, pp. 71-72, fig. 3:9
1869
Orthoceras laevigatum Boll — Karsten, pp. 47, fig. 16:2a,b
1889
?Orthoceras aff. ariel Barrande, 1868 — Rüdiger, pp. 10-11
1932
Protobactrites delicatulum sp. nov. — Troedsson, pp. 32,33, fig. 2:5; 4:3; 7:1
1952
Polygrammoceras delicatulum Troedsson — Flower, pp. 36
1984
Protobactrites delicatulum Troedsson — Dzik, pp. 105, 106, fig. text fig 39
2004
Plagiostomoceras laevigatum (Boll, 1857) — Kröger, pp. 65, fig. 12A,B