1953
Illaenus sulcifrons Holm — Jaanusson, pp. 474
1953
Illaenus aff. sulcifrons Holm — Jaanusson & Mutvei, pp. 11,14, 16, 19
1953
Illaenus planifrons n. sp. (Nomen nudum) — Jaanusson & Mutvei, pp. 34
1957
Illaenus planifrons n. sp. — Jaanusson, pp. 142-145, fig. 9: 3-7, 9-11; 10: 1