- Achnanthidium delicatulum sensu Schumann, 1867 (uncertain > unassessed)
- Achnanthidium delicatulum f. delicatulum Kützing, 1844 (uncertain > unassessed)
- Gololobovia obliqua (W.Gregory) Kulikovskiy, Glushchenko & Kociolek in Kulikovskiy et al., 2020
- Planothidium delicatulum (Kützing) Round & Bukhtiyarova, 1996 accepted as Achnanthidium delicatulum f. delicatulum Kützing, 1844
- Planothidium hauckianum (Grunow) Round & Bukhtiyarova, 1996
- Planothidium hauckianum var. rostratum (Schulz ex Hustedt) N.A.Andresen, E.F.Stoermer & R.G.Kreis, Jr., 2000 (uncertain > unassessed)
- Psammothidium obliquum (W. Gregory, 1856) Potapova, 2018 accepted as Gololobovia obliqua (W.Gregory) Kulikovskiy, Glushchenko & Kociolek in Kulikovskiy et al., 2020