1860
Illaenus oblongatus Angelin — Eichwald, pp. 1481, fig. 53: 5
1886
Illaenus oblongatus (Ang.) Stammform — Holm, pp. 119-120, fig. 8: 10-13
1886
Illaenus oblongatus Forma excellens — Holm, pp. 120, fig. 8: 1-3
1907
Illaenus oblongatus Angelin — Schmidt, pp. 49
1907
Illaenus oblongatus Angelin — Wiman, pp. 99
1953
Illaenus oblongatus excellens Holm — Jaanusson, pp. 478
1953
Illaenus excellens Holm, 1886 — Jaanusson & Mutvei, pp. 14
1954
Illaenus excellens Holm, 1886 — Jaanusson, fig. 10B
1957
Illaenus excellens Holm, 1886 — Jaanusson, pp. 136-138