TABLE 1.
Genera of microbial eukaryotes in which metallothioneins have been predicted and eventually described12.
| Supergroup | Phylum | Class | Genus | No of proteins |
| Alveolata | Ciliophora | Oligohymenophorea | Tetrahymena | 65 |
| Alveolata | Apicomplexa | Babesia | 14 | |
| Amoebozoa | Conosa | Archamoebea | Entamoeba | 8 |
| Alveolata | Apicomplexa | Plasmodium | 7 | |
| Alveolata | Apicomplexa | Theileria | 7 | |
| Alveolata | Ciliophora | Oligohymenophorea | Paramecium | 5 |
| Apusozoa | Apusomonadidae | Apusomonadidae Group II | Thecamonas | 4 |
| Opisthokonta | Choanoflagellida | Choanoflagellatea | Monosiga | 4 |
| Stramenopiles | Ochrophyta | Pelagophyceae | Aureococcus | 4 |
| Excavata | Metamonada | Parabasalia | Trichomonas | 3 |
| Stramenopiles | Oomycota | Phytophthora | 3 | |
| Alveolata | Ciliophora | Oligohymenophorea | Ichthyophthirius | 2 |
| Alveolata | Dinoflagellata | Dinophyceae | Symbiodinium | 2 |
| Amoebozoa | Evosea | Eumycetozoa | Cavenderia | 2 |
| Excavata | Discoba | Heterolobosea | Naegleria | 2 |
| Opisthokonta | Choanoflagellida | Choanoflagellatea | Salpingoeca | 2 |
| Opisthokonta | Mesomycetozoa | Filasterea | Capsaspora | 2 |
| Stramenopiles | Ochrophyta | Bacillariophyta | Thalassiosira | 2 |
| Stramenopiles | Oomycetes | Oomycetes | Peronospora | 2 |
| Alveolata | Ciliophora | Spirotrichea | Stylonychia | 1 |
| Amoebozoa | Conosa | Mycetozoa-Dictyostelea | Dictyostelium | 1 |
| Excavata | Discoba | Euglenozoa | Trypanosoma | 1 |
| Stramenopiles | incertae sedis | Opalinata | Blastocystis | 1 |
| Archaeoplastida | Mamiellophyceae | Mamiellophyceae | Ostreococcus | 1 |
| Archaeoplastida | Chlorophyta | Trebouxiophyceae | Chlorella | 6 |
| Archaeoplastida | Chlorophyta | Trebouxiophyceae | Micractinium | 2 |
| Stramenopiles | Ochrophyta | Eustigmatophyceae | Nannochloropsis | 1 |
1Data from GenBank (November 2019). 2Phototrophic species are in bold.