| [20236] Scenedesmus acutus var. acutus | Appellations de Taxon | 20236 |
| [20237] Scenedesmus bicaudatus var. brevicaudatus | Appellations de Taxon | 20237 |
| [20238] Scenedesmus calyptratus | Appellations de Taxon | 20238 |
| [20239] Scenedesmus denticulatus var. fenestratus | Appellations de Taxon | 20239 |
| [2024] Cambaridae | Appellations de Taxon | 2024 |
| [20240] Scenedesmus disciformis f. disciformis | Appellations de Taxon | 20240 |
| [20241] Scenedesmus ecornis var. polymorphus | Appellations de Taxon | 20241 |
| [20242] Scenedesmus fusiformis | Appellations de Taxon | 20242 |
| [20243] Scenedesmus lefevrei var. manguinii | Appellations de Taxon | 20243 |
| [20244] Scenedesmus pecsensis | Appellations de Taxon | 20244 |
| [20245] Scenedesmus similageneus | Appellations de Taxon | 20245 |
| [20246] Scenedesmus tibiscensis | Appellations de Taxon | 20246 |
| [20247] Schroederia antillarum | Appellations de Taxon | 20247 |
| [20248] Siderocelis minor | Appellations de Taxon | 20248 |
| [20249] Siderocelis oblonga | Appellations de Taxon | 20249 |
| [20250] Snowella rosea | Appellations de Taxon | 20250 |
| [20251] Sphaeroeca | Appellations de Taxon | 20251 |
| [20252] Sphaeroeca volvox | Appellations de Taxon | 20252 |
| [20253] Spirulina major | Appellations de Taxon | 20253 |
| [20254] Spondylosium clepsydra | Appellations de Taxon | 20254 |
| [20255] Spondylosium pygmaeum | Appellations de Taxon | 20255 |
| [20256] Staurastrum johnsonii var. triradiatum | Appellations de Taxon | 20256 |
| [20258] Staurastrum orbiculare | Appellations de Taxon | 20258 |
| [20259] Staurastrum orbiculare var. hibernicum | Appellations de Taxon | 20259 |
| [20260] Staurastrum planctonicum var. bulbosum | Appellations de Taxon | 20260 |
| [20261] Staurastrum pseudotetracerum | Appellations de Taxon | 20261 |
| [20262] Staurastrum sebaldi var. ornatum | Appellations de Taxon | 20262 |
| [20263] Staurastrum sebaldi var. ornatum f. quadribrachiata | Appellations de Taxon | 20263 |
| [20264] Staurodesmus spencerianus | Appellations de Taxon | 20264 |
| [20265] Staurodesmus validus | Appellations de Taxon | 20265 |
| [20266] Stelexomonas | Appellations de Taxon | 20266 |
| [20267] Stichococcus pelagicus | Appellations de Taxon | 20267 |
| [20268] Stichogloea globosa | Appellations de Taxon | 20268 |
| [20269] Synechococcus sciophilus | Appellations de Taxon | 20269 |
| [2027] Procambarus | Appellations de Taxon | 2027 |
| [20270] Synechocystis aquatilis | Appellations de Taxon | 20270 |
| [20271] Synechocystis parvula | Appellations de Taxon | 20271 |
| [20272] Synechocystis septentrionalis | Appellations de Taxon | 20272 |
| [20273] Tetrachlorella incerta | Appellations de Taxon | 20273 |
| [20274] Tetrachlorella ornata | Appellations de Taxon | 20274 |
| [20275] Tetraedron pentaedricum | Appellations de Taxon | 20275 |
| [20276] Tetraselmis arnoldii | Appellations de Taxon | 20276 |
| [20277] Thorakochloris | Appellations de Taxon | 20277 |
| [20278] Thorakochloris tetras | Appellations de Taxon | 20278 |
| [20279] Trachelomonas abrupta | Appellations de Taxon | 20279 |
| [2028] Procambarus clarkii | Appellations de Taxon | 2028 |
| [20280] Trachelomonas volvocina var. subglobosa | Appellations de Taxon | 20280 |
| [20281] Trachydiscus | Appellations de Taxon | 20281 |
| [20282] Trachydiscus lenticularis | Appellations de Taxon | 20282 |
| [20283] Treubaria varia | Appellations de Taxon | 20283 |