| [18691] Stauroneis schulzii | Appellations de Taxon | 18691 |
| [18692] Sellaphora subdeliberata | Appellations de Taxon | 18692 |
| [18693] Stauroneis subdahomensis | Appellations de Taxon | 18693 |
| [18694] Stauroneis senegalensis | Appellations de Taxon | 18694 |
| [18695] Stauroneis septentrionalis | Appellations de Taxon | 18695 |
| [18696] Subsilicea fragilarioides | Appellations de Taxon | 18696 |
| [18697] Surirella strigosa | Appellations de Taxon | 18697 |
| [18698] Stauroneis subgracilis | Appellations de Taxon | 18698 |
| [18699] Stauroneis strelnikovae | Appellations de Taxon | 18699 |
| [187] Pararhyacophila | Appellations de Taxon | 187 |
| [1870] Rumex | Appellations de Taxon | 1870 |
| [18700] Staurosira leptostauron | Appellations de Taxon | 18700 |
| [18701] Surirella sublinearis | Appellations de Taxon | 18701 |
| [18702] Stauroneis staurolineata | Appellations de Taxon | 18702 |
| [18703] Stauroneis subgracilior | Appellations de Taxon | 18703 |
| [18704] Stauroneis smithii var. borgei | Appellations de Taxon | 18704 |
| [18705] Stauroneis smithii var. incisa | Appellations de Taxon | 18705 |
| [18706] Stauroneis smithii var. karelica | Appellations de Taxon | 18706 |
| [18707] Stauroneis smithii var. minima | Appellations de Taxon | 18707 |
| [18708] Stauroneis sofia | Appellations de Taxon | 18708 |
| [18709] Surirella sparsipunctata | Appellations de Taxon | 18709 |
| [18710] Surirella splendidioides | Appellations de Taxon | 18710 |
| [18711] Surirella spinifera | Appellations de Taxon | 18711 |
| [18712] Surirella sublinearis var. suggesta | Appellations de Taxon | 18712 |
| [18713] Surirella striatula var. biplicata | Appellations de Taxon | 18713 |
| [18714] Synedra ulna var. platycephala | Appellations de Taxon | 18714 |
| [18715] Surirella promontorium | Appellations de Taxon | 18715 |
| [18716] Stauroneis ursamaioris | Appellations de Taxon | 18716 |
| [18717] Surirella suecica abnormal form | Appellations de Taxon | 18717 |
| [18718] Surirella tenera f. manguini | Appellations de Taxon | 18718 |
| [18719] Surirella tenacis | Appellations de Taxon | 18719 |
| [1872] Rumex crispus | Appellations de Taxon | 1872 |
| [18720] Surirella tortilis | Appellations de Taxon | 18720 |
| [18721] Surirella tenera var. subconstricta | Appellations de Taxon | 18721 |
| [18722] Surirella tuberosa | Appellations de Taxon | 18722 |
| [18723] Surirella ventricosa | Appellations de Taxon | 18723 |
| [18724] Stephanodiscus vestibulis | Appellations de Taxon | 18724 |
| [18725] Stauroneis visenda | Appellations de Taxon | 18725 |
| [18726] Stauroneis valeriana | Appellations de Taxon | 18726 |
| [18727] Surirella verrucosa | Appellations de Taxon | 18727 |
| [18728] Sellaphora ventraloconfusa | Appellations de Taxon | 18728 |
| [18729] Synedropsis waernii | Appellations de Taxon | 18729 |
| [1873] Rumex hydrolapathum | Appellations de Taxon | 1873 |
| [18730] Surirella wetzelii | Appellations de Taxon | 18730 |
| [18731] Stauroneis wipplingeri | Appellations de Taxon | 18731 |
| [18732] Surirella murielae | Appellations de Taxon | 18732 |
| [18733] Stauroneis undata | Appellations de Taxon | 18733 |
| [18734] Surirella neocaledonica | Appellations de Taxon | 18734 |
| [18735] Surirella nyassae | Appellations de Taxon | 18735 |
| [18736] Surirella oblonga | Appellations de Taxon | 18736 |