Achnanthidium arcticum Cleve, 1873 (uncertain > unassessed )
Achnanthidium delicatulum sensu Schumann, 1867 (uncertain > unassessed )
Achnanthidium delicatulum f. delicatulum Kützing, 1844 (uncertain > unassessed )
Achnanthidium exile (Kützing) Heiberg, 1863 accepted as Achnanthes exilis var. exilis Kützing, 1833
Achnanthidium hungaricum Grunow, 1863 (uncertain > unassessed )
Achnanthidium lanceolatum Brébisson ex Kützing, 1846 accepted as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999
Achnanthidium lanceolatum f. lanceolatum Brébisson ex Kützing, 1846 (uncertain > unassessed )
Achnanthidium lanceolatum f. typica Meister, 1912 (uncertain > unassessed )
Achnanthidium lapidosum (Krasske) Kobayasi, 2002 accepted as Nupela lapidosa (Krasske) Lange-Bertalot, 1999
Achnanthidium lineare W.Smith, 1855 (uncertain > unassessed )
Achnanthidium microcephalum Kützing, 1844 (uncertain > unassessed )
Achnanthidium microcephalum sensu Neupauer, 1867 (uncertain > unassessed )
Achnanthidium minutissimum (Kützing) Czarnecki, 1994 accepted as Achnanthes minutissima var. minutissima Kützing, 1833
Achnanthidium modestiforme (Lange-Bert.) Van de Vijver in Van de Vijver et al., 2002
Achnanthidium subatomoides (Hustedt) O. Monnier, H. Lange-Bertalot & L. Ector in Monnier et al., 2007 accepted as Navicula subatomoides Hustedt, 1936
Eucocconeis austriaca (Hustedt) H. Lange-Bertalot apud H. Lange-Bertalot & S.I. Genkal in H. Lange-Bertalot (ed.), 1999 accepted as Achnanthes austriaca var. austriaca Hust., 1922 accepted as Achnanthes austriaca Hust., 1922
Eucocconeis lapponica Hustedt, 1924 (uncertain > unassessed )
Eucocconeis lapponica var. ninckei (Guermeur & Manguin) Edlund, 1994 accepted as Achnanthes ninckei P.Guermeur & E.Manguin, 1953
Eucocconeis quadratarea (Østrup) Lange-Bertalot, 1999 (uncertain > unassessed )
Karayevia clevei (Grunow) Round & Bukhtiyarova, 1999
Karayevia oblongella (Østrup) M.Aboal, 2003 accepted as Achnanthes oblongella Østrup, 1902
Lemnicola hungarica (Grunow) F.E.Round & P.W.Basson, 1997 accepted as Achnanthidium hungaricum Grunow, 1863
Planothidium apiculatum (Patrick) R.Lowe in Johansen et al., 2004 accepted as Planothidium apiculatum (R.M.Patrick) Lange-Bertalot, 1999
Planothidium apiculatum (R.M.Patrick) Lange-Bertalot, 1999
Planothidium conspicuum (A.Mayer) M.Aboal, 2003 accepted as Achnanthes conspicua var. conspicua A.Mayer, 1919
Planothidium delicatulum (Kützing) Round & Bukhtiyarova, 1996 accepted as Achnanthidium delicatulum f. delicatulum Kützing, 1844
Planothidium engelbrechtii (Cholnoky) Round & L.Bukhtiyarova, 1996 accepted as Achnanthes engelbrechtii var. engelbrechtii Cholnoky, 1955
Planothidium hauckianum (Grunow) Round & Bukhtiyarova, 1996
Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999
Psammothidium abundans (Manguin, Bourrelly & Manguin) L.Bukhtiyarova, 1996
Psammothidium chlidanos (Hohn & Hellerman) Lange-Bertalot, 1999 accepted as Achnanthes chlidanos M.H.Hohn & Hellerman, 1963
Psammothidium marginulatum (Grunow) L.Bukhtiyarova & Round, 1996 accepted as Achnanthes marginulata var. marginulata Grunow in Cleve & Grunow, 1880
Psammothidium montanum (Krasske) Mayuma, 2002 accepted as Achnanthes montana var. montana Krasske, 1929
Rossithidium nodosum (Cleve) M.Aboal, 2003 accepted as Achnanthes nodosa Cleve, 1900