- Neidium affine (Ehrenberg) Pfizer, 1871
- Neidium affine var. capitata K. Mölder, 1937 (uncertain > unassessed)
- Neidium binode (Ehrenberg) Hustedt, 1945 accepted as Neidiomorpha binodis (Ehrenberg) M.Cantonati, Lange-Bertalot & N.Angeli, 2010
- Neidium dubium (Ehenberg) Cleve, 1894
- Neidium dubium f. constricta (Hustedt) Hustedt, 1930 accepted as Neidium dubium var. constricta Hustedt, 1922
- Neidium dubium var. constricta Hustedt, 1922 (uncertain > unassessed)
- Neidium iridis (Ehrenberg) Cleve, 1894
- Neidium iridis var. amphigomphus (Ehrenberg) A.Mayer, 1917
- Neidium productum (W.Smith) Cleve, 1894