Toxarium frauenfeldii (uncertain > unassessed )
Toxarium frauenfeldii var. doljensis (Pantocsek) De Toni, 1892 accepted as Synedra frauenfeldii var. doljensis Pantocsek, 1886
Toxarium frauenfeldii var. frauenfeldii (Grunow) De Toni, 1892 accepted as Synedra frauenfeldii var. frauenfeldii Grunow, 1862
Toxarium hennedyana (uncertain > unassessed )
Toxarium hennedyana var. hennedyana Van Heurck, 1881 (uncertain > unassessed )
Toxarium hennedyanum (Gregory) Pelletan, 1889
Toxarium hennedyanum var. hennedyanum (Gregory) Pelletan, 1889 accepted as Synedra hennedyana f. hennedyana Gregory, 1857
Toxarium hennedyanum var. insignis (Peragallo & Peragallo) M. Peragallo, 1903 accepted as Synedra hennedyana var. insignis Peragallo & Peragallo, 1900
Toxarium reinboldii (Van Heurck) F.W. Mills, 1935 accepted as Synedra reinboldii Van Heurck, 1909
Toxarium rostratum Hantzsch, 1863 (uncertain > unassessed )
Toxarium semilunare Lemmermann, 1899 (uncertain > unassessed )
Toxarium undosum (Grunow) De Toni, 1892 accepted as Synedra undosa Grunow, 1867
Toxarium undulatum Bailey, 1854 (uncertain > unassessed )
Toxarium undulatum var. ponticum Petkoff (uncertain > unassessed )