The Phyla of Kingdom Protista
| Phylum | Common Name | Number of Species |
| Acrasiomycota | slime moulds | 65 |
| Bacillariophyta | diatoms | 100,000 |
| Chlorophyta | algae | 7000 |
| Ciliophora | ciliates | 8000 |
| Dinoflagellata | dinoflagellates | 4000 |
| Euglenophyta | euglenoids | 800 |
| Foraminifera | foraminiferans | hundreds |
| Myxomycota | plasmodial slime moulds | 450 |
| Oomycota | water moulds, white rusts | 475 |
| Phaecophyta | brown algae | 1500 |
| Rhizopoda | amoebas | hundreds |
| Rhodophyta | red algae | 4000 |
| Sporozoa | sporozoans | 3900 |
| Zoomastigina | zoomastigotes | thousands |