| [12240] Cymbopleura subheteropleura | Appellations de Taxon | 12240 |
| [12241] Caloneis salebrastriata | Appellations de Taxon | 12241 |
| [12242] Cymbopleura sublancettula | Appellations de Taxon | 12242 |
| [12243] Cymbopleura sublanceolata var. javanica | Appellations de Taxon | 12243 |
| [12244] Cymbopleura sublanceolata var. sublanceolata | Appellations de Taxon | 12244 |
| [12245] Cymbella subleptoceros | Appellations de Taxon | 12245 |
| [12246] Cyclotella sevillana | Appellations de Taxon | 12246 |
| [12247] Cymbopleura similiformis var. angusta | Appellations de Taxon | 12247 |
| [12248] Cymbopleura similiformis var. similiformis | Appellations de Taxon | 12248 |
| [12249] Caloneis silicula var. gibbosa | Appellations de Taxon | 12249 |
| [1225] Calliergon cordifolium | Appellations de Taxon | 1225 |
| [12250] Cyclotella stelligera var. glomerata | Appellations de Taxon | 12250 |
| [12251] Ceratoneis signata | Appellations de Taxon | 12251 |
| [12252] Cymbella stigmaphora | Appellations de Taxon | 12252 |
| [12253] Cymbella sinuata var. arctica | Appellations de Taxon | 12253 |
| [12254] Cymbella sinuata var. capitata | Appellations de Taxon | 12254 |
| [12255] Caloneis silicula var. inflata | Appellations de Taxon | 12255 |
| [12256] Cocconeis scutellum var. japonica | Appellations de Taxon | 12256 |
| [12257] Caloneis silicula var. jenisseyensis | Appellations de Taxon | 12257 |
| [12258] Cymbella subkolbei | Appellations de Taxon | 12258 |
| [12259] Climaconeis scalaris | Appellations de Taxon | 12259 |
| [1226] Calliergon giganteum | Appellations de Taxon | 1226 |
| [12260] Cocconeis scutellum var. minutissima | Appellations de Taxon | 12260 |
| [12261] Cocconeis scutellum f. minuta | Appellations de Taxon | 12261 |
| [12263] Cymbella sinica var. miyiensis | Appellations de Taxon | 12263 |
| [12264] Cymbella sinica | Appellations de Taxon | 12264 |
| [12265] Cymbella sphaerophora | Appellations de Taxon | 12265 |
| [12266] Craspedodiscus splendidus | Appellations de Taxon | 12266 |
| [12267] Cymbella superparva | Appellations de Taxon | 12267 |
| [12268] Caloneis silicula f. peisonis | Appellations de Taxon | 12268 |
| [12269] Cocconeis septentrionalis | Appellations de Taxon | 12269 |
| [1227] Calliergonella | Appellations de Taxon | 1227 |
| [12270] Cymbella subparviformis | Appellations de Taxon | 12270 |
| [12271] Cyclotella stelligera var. pseudostelligera f. wolterecki | Appellations de Taxon | 12271 |
| [12272] Caloneis silicula var. subconstricta | Appellations de Taxon | 12272 |
| [12273] Cyclotella stelligera var. stelligeroides | Appellations de Taxon | 12273 |
| [12274] Cyclotella striata var. subsalina | Appellations de Taxon | 12274 |
| [12275] Cyclotella striata var. bipunctata | Appellations de Taxon | 12275 |
| [12276] Cyclotella styriaca | Appellations de Taxon | 12276 |
| [12277] Cocconeis stauroneiformis | Appellations de Taxon | 12277 |
| [12278] Cymbella subturgidula | Appellations de Taxon | 12278 |
| [12279] Cymbella suecica | Appellations de Taxon | 12279 |
| [1228] Calliergonella cuspidata | Appellations de Taxon | 1228 |
| [12280] Craticula salsuginosa | Appellations de Taxon | 12280 |
| [12281] Cymbella sumatrensis | Appellations de Taxon | 12281 |
| [12282] Caloneis silicula var. undulata | Appellations de Taxon | 12282 |
| [12283] Cymbella subtruncata var. subtruncata | Appellations de Taxon | 12283 |
| [12284] Cymbella suavis | Appellations de Taxon | 12284 |
| [12285] Craticula sverirschopkae | Appellations de Taxon | 12285 |
| [12286] Cyclotella sexnotata | Appellations de Taxon | 12286 |