| [18967] Trochosira coronata | Appellations de Taxon | 18967 |
| [18968] Trachysphenia acuminata | Appellations de Taxon | 18968 |
| [18969] Trinacria cristata | Appellations de Taxon | 18969 |
| [1897] Ranunculus aconitifolius | Appellations de Taxon | 1897 |
| [18970] Thalassiosira curviseriata | Appellations de Taxon | 18970 |
| [18971] Tryblionella debilis | Appellations de Taxon | 18971 |
| [18972] Trossulus elegantulus | Appellations de Taxon | 18972 |
| [18973] Tetracyclus emarginatus | Appellations de Taxon | 18973 |
| [18974] Trinacria excavata | Appellations de Taxon | 18974 |
| [18975] Thalassiosira fallax | Appellations de Taxon | 18975 |
| [18976] Tabellaria flocculosa var. andina | Appellations de Taxon | 18976 |
| [18977] Thalassiosira faurii | Appellations de Taxon | 18977 |
| [18978] Thalassiosira flexuosa var. tenella | Appellations de Taxon | 18978 |
| [18979] Talaroneis furcigerum | Appellations de Taxon | 18979 |
| [1898] Ranunculus aquatilis | Appellations de Taxon | 1898 |
| [18980] Tryblionella gracilis var. ambigua | Appellations de Taxon | 18980 |
| [18981] Thalassiothrix gibberula | Appellations de Taxon | 18981 |
| [18982] Thalassiosira angulata | Appellations de Taxon | 18982 |
| [18983] Thalassiosira hasleae | Appellations de Taxon | 18983 |
| [18984] Thalassiothrix antarctica | Appellations de Taxon | 18984 |
| [18985] Thalassionema bacillare | Appellations de Taxon | 18985 |
| [18986] Thalassiosira binata | Appellations de Taxon | 18986 |
| [18987] Thalassiosira californica | Appellations de Taxon | 18987 |
| [18988] Triceratium hebetatum | Appellations de Taxon | 18988 |
| [18989] Thalassiosira eccentrica | Appellations de Taxon | 18989 |
| [1899] Ranunculus baudotii | Appellations de Taxon | 1899 |
| [18990] Thalassiosira diporocyclus | Appellations de Taxon | 18990 |
| [18991] Triceratium dobreeanum var. novazealandica | Appellations de Taxon | 18991 |
| [18992] Triceratium dobreeanum | Appellations de Taxon | 18992 |
| [18993] Triceratium dubium | Appellations de Taxon | 18993 |
| [18994] Thalassiosira duostra | Appellations de Taxon | 18994 |
| [18995] Thalassiosira echinata | Appellations de Taxon | 18995 |
| [18996] Tetracyclus eckhardii | Appellations de Taxon | 18996 |
| [18997] Thalassiosira flexuosa | Appellations de Taxon | 18997 |
| [18998] Tabellaria flocculosa abnormal form | Appellations de Taxon | 18998 |
| [18999] Triceratium formosum | Appellations de Taxon | 18999 |
| [19] Taeniopteryx schoenemundi | Appellations de Taxon | 19 |
| [190] Glossosoma | Appellations de Taxon | 190 |
| [1900] Ranunculus calcareus | Appellations de Taxon | 1900 |
| [19000] Triceratium formosum f. quinquelobata | Appellations de Taxon | 19000 |
| [19001] Tabularia grandis | Appellations de Taxon | 19001 |
| [19002] Tryblionella gracilis | Appellations de Taxon | 19002 |
| [19003] Thalassiosira grunowii | Appellations de Taxon | 19003 |
| [19004] Tryblionella gracilis var. subsalina | Appellations de Taxon | 19004 |
| [19005] Thalassiosira guillardii | Appellations de Taxon | 19005 |
| [19006] Thalassiosira antarctica var. borealis | Appellations de Taxon | 19006 |
| [19007] Thalassiosira eccentrica var. fasciculata | Appellations de Taxon | 19007 |
| [19008] Thalassiosira hendeyi | Appellations de Taxon | 19008 |
| [19009] Thalassiosira exceptiuncula | Appellations de Taxon | 19009 |
| [1901] Ranunculus circinatus | Appellations de Taxon | 1901 |