| [18921] Surirella tchadensis | Appellations de Taxon | 18921 |
| [18922] Surirella tumida | Appellations de Taxon | 18922 |
| [18923] Surirella visurgis | Appellations de Taxon | 18923 |
| [18924] Surirella welshii | Appellations de Taxon | 18924 |
| [18925] Surirella woltereckii | Appellations de Taxon | 18925 |
| [18926] Surirella variabilis | Appellations de Taxon | 18926 |
| [18927] Surirella vasta | Appellations de Taxon | 18927 |
| [18928] Surirella vandevijveri | Appellations de Taxon | 18928 |
| [18929] Surirella venusta | Appellations de Taxon | 18929 |
| [1893] Caltha palustris | Appellations de Taxon | 1893 |
| [18930] Sellaphora verecundiae | Appellations de Taxon | 18930 |
| [18931] Sieminskia wohlenbergii | Appellations de Taxon | 18931 |
| [18932] Stenoneis wojtek-kowalskii | Appellations de Taxon | 18932 |
| [18933] Surirella wolfensbergeri | Appellations de Taxon | 18933 |
| [18934] Tetracyclus arceli | Appellations de Taxon | 18934 |
| [18935] Thalassiosira allenii | Appellations de Taxon | 18935 |
| [18936] Terpsinoe americana | Appellations de Taxon | 18936 |
| [18937] Thalassiosira andamanica | Appellations de Taxon | 18937 |
| [18938] Tryblionella angustata | Appellations de Taxon | 18938 |
| [18939] Triceratium arcticum | Appellations de Taxon | 18939 |
| [1894] Damasonium | Appellations de Taxon | 1894 |
| [18940] Tryblionella acuminata var. subconstricta | Appellations de Taxon | 18940 |
| [18941] Tryblioptychus hainanensis | Appellations de Taxon | 18941 |
| [18942] Tabellaria binalis var. brevistriata | Appellations de Taxon | 18942 |
| [18943] Thalassiosira bipartita | Appellations de Taxon | 18943 |
| [18944] Thalassiosira brunii | Appellations de Taxon | 18944 |
| [18945] Thalassioneis signyensis | Appellations de Taxon | 18945 |
| [18946] Terpsinoe solida | Appellations de Taxon | 18946 |
| [18947] Thalassiothrix spathulata | Appellations de Taxon | 18947 |
| [18948] Triceratium spinosum | Appellations de Taxon | 18948 |
| [18949] Trochosira spinosus | Appellations de Taxon | 18949 |
| [1895] Damasonium alisma | Appellations de Taxon | 1895 |
| [18950] Thalassiosira temperei | Appellations de Taxon | 18950 |
| [18951] Thalassiosira thailandica | Appellations de Taxon | 18951 |
| [18952] Thalassiosira transitoria | Appellations de Taxon | 18952 |
| [18953] Triceratium trisulcum | Appellations de Taxon | 18953 |
| [18954] Tertiarius transilvanicus | Appellations de Taxon | 18954 |
| [18955] Tetracyclus tscheremissinovae | Appellations de Taxon | 18955 |
| [18956] Triceratium venosum | Appellations de Taxon | 18956 |
| [18957] Thalassiosira vulnifica | Appellations de Taxon | 18957 |
| [18958] Tabularia waernii | Appellations de Taxon | 18958 |
| [18959] Thallassiosiropsis wittiana | Appellations de Taxon | 18959 |
| [1896] Ranunculus | Appellations de Taxon | 1896 |
| [18960] Toxonidea gregoriana | Appellations de Taxon | 18960 |
| [18961] Thalassiothrix pseudonitzschioides | Appellations de Taxon | 18961 |
| [18962] Urosolenia eriensis var. morsa | Appellations de Taxon | 18962 |
| [18963] Tryblionella bathurstensis | Appellations de Taxon | 18963 |
| [18964] Thalassiosira bulbosa | Appellations de Taxon | 18964 |
| [18965] Tryblioptychus cocconeiformis | Appellations de Taxon | 18965 |
| [18966] Thalassiosira conferta | Appellations de Taxon | 18966 |