| [18783] Tryblionella aerophila | Appellations de Taxon | 18783 |
| [18784] Thalassiosira aestivalis | Appellations de Taxon | 18784 |
| [18785] Tabularia affinis | Appellations de Taxon | 18785 |
| [18786] Thalassiosira anguste-lineata | Appellations de Taxon | 18786 |
| [18787] Thalassiosira angstii | Appellations de Taxon | 18787 |
| [18788] Thalassiosira antarctica var. antarctica | Appellations de Taxon | 18788 |
| [18789] Tetracyclus baicalensis | Appellations de Taxon | 18789 |
| [1879] Montia fontana | Appellations de Taxon | 1879 |
| [18790] Thalassiosira baltica | Appellations de Taxon | 18790 |
| [18791] Tabularia barbatula | Appellations de Taxon | 18791 |
| [18792] Thalassiosira baltica var. batava | Appellations de Taxon | 18792 |
| [18793] Thalassiosira cardiophora | Appellations de Taxon | 18793 |
| [18794] Thalassiosira condensata | Appellations de Taxon | 18794 |
| [18795] Tetracyclus celatom | Appellations de Taxon | 18795 |
| [18796] Tryblionella chutteri | Appellations de Taxon | 18796 |
| [18797] Trachyneis clepsydra | Appellations de Taxon | 18797 |
| [18798] Trossulus californicus | Appellations de Taxon | 18798 |
| [18799] Synedra commutata | Appellations de Taxon | 18799 |
| [188] Hyperrhyacophila | Appellations de Taxon | 188 |
| [1880] Primulaceae | Appellations de Taxon | 1880 |
| [18800] Syndendrium diadema | Appellations de Taxon | 18800 |
| [18801] Stephanodiscus yellowstonensis | Appellations de Taxon | 18801 |
| [18802] Synedra gracilis | Appellations de Taxon | 18802 |
| [18803] Synedra hennedyana | Appellations de Taxon | 18803 |
| [18804] Synedra lata | Appellations de Taxon | 18804 |
| [18805] Synedra manguini | Appellations de Taxon | 18805 |
| [18806] Synedra montana | Appellations de Taxon | 18806 |
| [18807] Stauroneis zackenbergensis | Appellations de Taxon | 18807 |
| [18808] Sieminskia zeta | Appellations de Taxon | 18808 |
| [18809] Tabularia affinis var. acuminata | Appellations de Taxon | 18809 |
| [1881] Hottonia | Appellations de Taxon | 1881 |
| [18810] Tryblionella angustata var. acuta | Appellations de Taxon | 18810 |
| [18811] Stauroneis stellae | Appellations de Taxon | 18811 |
| [18812] Surirella stalagma | Appellations de Taxon | 18812 |
| [18813] Surirella sutilis | Appellations de Taxon | 18813 |
| [18815] Surirella sulcata | Appellations de Taxon | 18815 |
| [18816] Surirella susanae | Appellations de Taxon | 18816 |
| [18817] Stephanodiscus superiorensis | Appellations de Taxon | 18817 |
| [18818] Stephanodiscus subsalsus | Appellations de Taxon | 18818 |
| [18819] Stephanodiscus subtranssylvanicus | Appellations de Taxon | 18819 |
| [1882] Hottonia palustris | Appellations de Taxon | 1882 |
| [18820] Stauroneis svalbardensis | Appellations de Taxon | 18820 |
| [18821] Staurosira venter | Appellations de Taxon | 18821 |
| [18822] Stauroneis amphioxys | Appellations de Taxon | 18822 |
| [18823] Sellaphora tapajosensis | Appellations de Taxon | 18823 |
| [18824] Stauroneis supergracilis | Appellations de Taxon | 18824 |
| [18825] Stauroneis sphagnicola | Appellations de Taxon | 18825 |
| [18826] Stauroneis siberica var. papilionacea | Appellations de Taxon | 18826 |
| [18827] Staurosirella spinosa | Appellations de Taxon | 18827 |
| [18828] Sellaphora subpupula | Appellations de Taxon | 18828 |