Achnanthes bahusiensis (Grunow) Lange-Bert., 1989 accepted as Astartiella bahusiensis (Grunow) Witkowski, Lange-Bertalot & Metzeltin, 1998 accepted as Navicula minuscula var. bahusiensis Grunow, 1880
Achnanthes brevipes C.Agardh, 1824
Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 accepted as Achnanthes intermedia Kützing, 1833
Achnanthes delicatula (Kützing) Grunow in Cleve & Grunow, 1880 accepted as Planothidium delicatulum (Kützing) Round & Bukhtiyarova, 1996 accepted as Achnanthidium delicatulum f. delicatulum Kützing, 1844
Achnanthes delicatula subsp. hauckiana (Grunow) Lange-Bertalot & Ruppel, 1980 accepted as Planothidium hauckianum (Grunow) Round & Bukhtiyarova, 1996
Achnanthes hauckiana Grunow, 1880 (uncertain > unassessed )
Achnanthes hauckiana var. hauckiana Grunow in Cleve & Grunow, 1880 (uncertain > unassessed )
Achnanthes hauckiana var. rostrata Schulz, 1926 (uncertain > unassessed )
Achnanthes intermedia Kützing, 1833 (uncertain > unassessed )
Achnanthes longipes C.Agardh, 1824
Achnanthes obliqua (Gregory) Hustedt, 1924 accepted as Gololobovia obliqua (W.Gregory) Kulikovskiy, Glushchenko & Kociolek in Kulikovskiy et al., 2020
Achnanthes subsessilis Kützing, 1833 accepted as Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 accepted as Achnanthes intermedia Kützing, 1833
Achnanthes taeniata Grunow, 1880 accepted as Pauliella taeniata (Grunow) F.E.Round & P.W.Basson, 1997