Trigonium arcticum f. quadrata (Grunow) Desikachary 1989 [Link to DiatomBase]
Trigonium arcticum f. tetragona (A. Schmidt) Desikachary 1989 [Link to DiatomBase]
Trigonium arcticum var. californica (Grunow) Desikachary & Prema in Desikachary 1989 [Link to DiatomBase]
Trigonium arcticum var. californica (Grunow) Wornardt 1967?? [Link to DiatomBase]
Trigonium arcticum var. japonica (Grunow in Schmidt) Desikachary & Sreelatha 1989 [Link to DiatomBase]
Trigonium arcticum var. kerguelense (Grunow in Cleve & Grunow) Desikachary & Sreelatha in Desikachary & Devi 1986 [Link to DiatomBase]
Trigonium arcticum var. pentagonalis (Tempère & Peragallo) Desikachary & Sreelatha 1989 [Link to DiatomBase]
Trigonium arcticum var. quadrata (Grunow ex Tempère & Peragallo) Desikachary & Sreelatha 1989 [Link to DiatomBase]
Trigonium arcticum var. quinquelobatum (Greville) Desikachary & Devi 1986 [Link to DiatomBase]
Trigonium arcticum var. sexangulatum (Boyer) Desikachary & Prema 1987 [Link to DiatomBase]
Trigonium cinnamoneum (Greville) Mann 1937 [Link to DiatomBase]
Trigonium condecorum (Brightwell) Hendey 1981 [Link to DiatomBase]
Trigonium formosum (Brightwell) Hendey 1971 [Link to DiatomBase]
Trigonium formosum f. hexagonale Navarro 1981 [Link to DiatomBase]
Trigonium formosum f. quadrangularis (Greville) Desikachary & Sreelatha 1989 [Link to DiatomBase]
Trigonium formosum f. tetragona Desikachary 1989 [Link to DiatomBase]
Trigonium formosum var. pentagonalis (A. Schmidt) Desikachary & Prema 1987 [Link to DiatomBase]
Trigonium gallapagense (Cleve) Desikachary & Sreelatha 1989 [Link to DiatomBase]
Trigonium graeffeanum (Witt) Hendey 1971 [Link to DiatomBase]
Trigonium hertleinii (Hanna) V.A. Nikolaev & E. Fourtanier in Nikolaev, V.A., Kociolek, J.P., Fourtanier, E., Barron, J.A. & Harwood, D.M. 2001 [Link to DiatomBase]
Trigonium inelegans var. micropora (Grunow in Van Heurck) Desikachary & Sreelatha 1989 [Link to DiatomBase]
Trigonium inelegans var. tubulosa (Brun) Desikachary & Sreelatha 1989 [Link to DiatomBase]
Trigonium latum var. dissimile (Grunow) Desikachary 1989 [Link to DiatomBase]
Trigonium lineatum (Greville) Desikachary & Sreelatha 1989 [Link to DiatomBase]
Trigonium lineatum f. biangulata (Laporte & Lefebure) Desikachary & Sreelatha 1989 [Link to DiatomBase]
Trigonium moronense (Greville) Desikachary 1989 [Link to DiatomBase]
Trigonium moronense var. nicobarica (Grunow in Van Heurck) Desikachary 1989 [Link to DiatomBase]
Trigonium reticulum (Ehrenberg) Simonsen 1974 [Link to DiatomBase]
Trigonium reticulum f. tetragona (Grunow in Van Heurck) Desikachary 1989 [Link to DiatomBase]