| Name | Author | Source | Citation | Year |
|---|
| Cosmarium granatum var. trigonium | Printz | image |
| PALAEOTRIGONIUM | Vologdin | image |
| Palaeotrigonium irregulare | Vologdin | image |
| Palaeotrigonium longisculum | Vologdin | image |
| Palaeotrigonium pulchrum | Vologdin | image |
| TRIGONIUM | (Cleve) Hustedt | image |
| TRIGONIUM | Cleve | image |
| Trigonium adspersum | Mann | image |
| Trigonium alternans | (Bail.) Mann | image |
| Trigonium antarcticum | R.M. Gogorev & Z.V. Pushina | Nov. Sist. Nizsh. Rast. [Bot. Inst. Akad. Nauk SSSR] | 46: 38, pl. I: fig. 3; pl. III: figs. 3-6; pl. IV: figs. 1-4 | 2012 |
| Trigonium arcticum | (Brightwell) Cleve | image |
| Trigonium arcticum f. quadratum_(`quadrata') | T.V. Desikachary | Atlas Diat. | 6: 12, pl. 802: fig. 4 | 1989 |
| Trigonium arcticum f. tetragonum_('tetragona') | T.V. Desikachary | image |
| Trigonium arcticum f. tetragonum_(`tetragona') | T.V. Desikachary | Atlas Diat. | 6: 12 | 1989 |
| Trigonium arcticum var. californicum_('californica') | (Grunow) Wornardt | image |
| Trigonium arcticum var. kerguelense | (Grunow) Desikachary & Sreelatha | image |
| Trigonium arcticum var. sexangulatum | (Boyer) Desikachary & Prema invalid | image |
| Trigonium arcticum var. sexangulatum | (C.S. Boyer) T.V. Desikachary & P. Prema in T.V. Desikachary | Atlas Diat. | 6: 15 | 1989 |
| Trigonium bicoronatum | (Castracane) A. Mann | image |
| Trigonium caelatum | (Janisch) A. Mann | image |
| Trigonium cinnamomeum | (Grev.) Mann | image |
| Trigonium cinnamomeum | (Greville) A. Mann | Contr. U.S. Natl. Herb. | 10: 292 | 1907 |
| Trigonium condecorum | (Ehrenberg) Hendey | image |
| Trigonium contumax | A. Mann | image |
| Trigonium coscinoides | (Grove & Sturt) Mann | image |
| Trigonium curvatum_('curvatus') | A. Nair, R. Mohan, S. Shetye, S. Gazi & S.A. Jafar | Micropaleontology | 61: 186, figs. 1-12 | 2015 |
| Trigonium diaphanum | A. Mann | image |
| Trigonium dissimile | (Grunow) A. Mann | image |
| Trigonium dulce | (Greville) A. Mann | image |
| Trigonium eulensteinii | (Grunow) A. Mann | image |
| Trigonium formosum | (Brightwell) Frenguelli | image |
| Trigonium formosum f. quadrangulare_('quadrangularis') | (Greville) Desikachary & Sreelatha | Bibliotheca Diatomologica | 19: 275 | 1989 |
| Trigonium formosum f. tetragonum_(`tetragona') | T.V. Desikachary | Atlas Diat. | 6: 12, pl. 802: figs. 5, 6 | 1989 |
| Trigonium formosum var. pentagonale_('pentagonalis') | (A. Schmidt) Desikachary & Prema | image |
| Trigonium frauenfeldii | (Grunow) A. Mann | image |
| Trigonium geminum | (A. Schmidt) A. Mann | image |
| Trigonium graeffeanum | (O. Witt) Hendey | Nova Hedwigia | 22: 382 | 1972 |
| Trigonium graeffeanum | (Witt) Hendey | image |
| Trigonium hertleinii | (Hanna) V.A. Nikolaev & E. Fourtanier in V.A. Nikolaev, J.P. Kociolek, E. Fourtanier, J.A. Barron, & D.M. Harwood | Occas. Pap. Calif. Acad. Sci. | 152: 20 | 2001 |
| Trigonium heteroporum | (Grunow) A. Mann | image |
| Trigonium inelegans | (Greville) A. Mann | image |
| Trigonium inglorium | (Greville) A. Mann | image |
| Trigonium latum | (Greville) A. Mann | image |
| Trigonium latum var. dissimile | (Grunow ex A. Schmidt) T.V. Desikachary | Atlas Diat. | 6: 12 | 1989 |
| Trigonium membranaceum | (Cleve) A. Mann | image |
| Trigonium moronense | (Greville) T.V. Desikachary | Atlas Diat. | 6: 15 | 1989 |
| Trigonium moronense var. nicobaricum_(`nicobarica') | (Grunow) T.V. Desikachary | Atlas Diat. | 6: 15 | 1989 |
| Trigonium multiplex | (Janisch) A. Mann | image |
| Trigonium oamaruense | (Grove & Sturt) Mann | image |
| Trigonium oamaruense var. sparsimpunctatum_('sparsim-punctata') | (Grove) Mann | image |
| Trigonium parallelum | (Ehrenberg) Mann | image |
| Trigonium pardus | (A. Schmidt) A. Mann | image |
| Trigonium planoconcavum_('plano-concavum') | (Brun) Mann | image |
| Trigonium punctatum | (Brightwell) A. Mann | image |
| Trigonium radfordianum | (Castracane) A. Mann | image |
| Trigonium reticulum | (Ehrenberg) Simonsen | image |
| Trigonium reticulum f. tetragonum_(`tetragona') | (Cleve-Euler) T.V. Desikachary | Atlas Diat. | 6: 12 | 1989 |
| Trigonium rusticum | Mann | image |
| Trigonium sculptum | (Shadb.) Mann | image |
| Trigonium striolatum | (Ehrenberg) Mann | image |
| Trigonium tabellarium | (Bright.) Mann | image |
| Trigonium trinitas | (Brun) Mann | image |
| Trigonium zonulatum | (Greville) Mann | image |