1961
Pachydictya ambigua — Phillips &Ross, pp. 339, fig. 44:1-6; 45:6,9
1965
Pachydictya ambigua Ross, 1961 — Astrova, pp. 282, fig. 57:1
1970
Pachydictya ambigua Ross — Astrova & Kopaevich, pp. 133, fig. table 14
1975
Pachydictya ambigua Ross, 1961 — Kopajevich, pp. 60
1993
Metadictya ambigua (Ross, 1961) — Gorjunova & Lavretjeva, pp. 47