| [1028] Ancylus | Appellations de Taxon | 1028 |
| [10280] Amphora archibaldii | Appellations de Taxon | 10280 |
| [10281] Auliscus accedens | Appellations de Taxon | 10281 |
| [10282] Aulacoseira accincta | Appellations de Taxon | 10282 |
| [10283] Amphora arenicola var. oculata | Appellations de Taxon | 10283 |
| [10284] Actinella aotearoaia | Appellations de Taxon | 10284 |
| [10285] Amphora aequatorialis | Appellations de Taxon | 10285 |
| [10286] Adlafia aquaeductae | Appellations de Taxon | 10286 |
| [10287] Achnanthes arctica | Appellations de Taxon | 10287 |
| [10288] Amphora arenicola | Appellations de Taxon | 10288 |
| [10289] Attheya armata | Appellations de Taxon | 10289 |
| [1029] Ancylus fluviatilis | Appellations de Taxon | 1029 |
| [10290] Amphora arenaria | Appellations de Taxon | 10290 |
| [10291] Achnanthes arenaria | Appellations de Taxon | 10291 |
| [10292] Amphora arenaria var. rattrayi | Appellations de Taxon | 10292 |
| [10293] Amphora arcus | Appellations de Taxon | 10293 |
| [10294] Amphora aspera | Appellations de Taxon | 10294 |
| [10295] Actinella astriata | Appellations de Taxon | 10295 |
| [10296] Achnanthes atacamae | Appellations de Taxon | 10296 |
| [10297] Asterolampra acutiloba | Appellations de Taxon | 10297 |
| [10298] Achnanthes atalanta | Appellations de Taxon | 10298 |
| [10299] Amphora atacamana | Appellations de Taxon | 10299 |
| [103] Leuctra prima | Appellations de Taxon | 103 |
| [1030] Ferrissia | Appellations de Taxon | 1030 |
| [10300] Amphora atacamana var. minor | Appellations de Taxon | 10300 |
| [10301] Amphora australiensis | Appellations de Taxon | 10301 |
| [10302] Amphora bacillaris | Appellations de Taxon | 10302 |
| [10303] Achnanthes baldjickii | Appellations de Taxon | 10303 |
| [10304] Actinodiscus barbadensis | Appellations de Taxon | 10304 |
| [10305] Amphora biggiba var. capitata | Appellations de Taxon | 10305 |
| [10306] Achnanthes bicapitata | Appellations de Taxon | 10306 |
| [10307] Actinocyclus beaufortianus | Appellations de Taxon | 10307 |
| [10308] Achnanthes bernierii | Appellations de Taxon | 10308 |
| [10309] Astartiella bahuensoides | Appellations de Taxon | 10309 |
| [10310] Astartiella bahusiensis | Appellations de Taxon | 10310 |
| [10311] Amphora biggiba var. interrupta | Appellations de Taxon | 10311 |
| [10312] Anaulus birostratus | Appellations de Taxon | 10312 |
| [10313] Achnanthidium blancheanum | Appellations de Taxon | 10313 |
| [10314] Asterionella bleakeleyi | Appellations de Taxon | 10314 |
| [10315] Aneumastus balticus | Appellations de Taxon | 10315 |
| [10316] Astartiella bremeyeri var. rostrata | Appellations de Taxon | 10316 |
| [10317] Astartiella bremeyeri | Appellations de Taxon | 10317 |
| [10318] Amphora boliviana var. elongata | Appellations de Taxon | 10318 |
| [10319] Amphora boliviana | Appellations de Taxon | 10319 |
| [1032] Acroloxidae | Appellations de Taxon | 1032 |
| [10320] Achnanthes borealis | Appellations de Taxon | 10320 |
| [10321] Actinella bourrellyi | Appellations de Taxon | 10321 |
| [10322] Achnanthes baldjickii var. podolica | Appellations de Taxon | 10322 |
| [10323] Amphora biarcuata | Appellations de Taxon | 10323 |
| [10324] Achnanthes brevipes | Appellations de Taxon | 10324 |