| Group | Common name | Features |
|---|---|---|
| Microsporidia | Microsporidia | Intracellular parasites of animals; greatly reduced, among smallest eukaryotes known; polar tube used to infect hosts |
| Chytrids (paraphyletic)a | Chytrids | Mostly aquatic and microscopic; zoospores and gametes have flagella |
| Chytridiomycota | ||
| Neocallimastigomycota | ||
| Blastocladiomycota | ||
| Zygomycota (paraphyletic)a | Zygospore fungi | Reproductive structure is a unicellular zygospore with many diploid nuclei; hyphae coenocytic; no fleshy fruiting body |
| Entomophthoromycotina | ||
| Kickxellomycotina | ||
| Mucoromycotina | ||
| Zoopagomycotina | ||
| Glomeromycota | Arbuscular mycorrhizal fungi | Form arbuscular mycorrhizae in plant roots; only asexual reproduction is known |
| Ascomycota | Sac fungi | Sexual reproductive saclike structure known as an ascus, which contains haploid ascospores; hyphae septate; dikaryon |
| Basidiomycota | Club fungi | Sexual reproductive structure is a basidium, a swollen cell at the tip of a specialized hypha that supports haploid basidiospores; hyphae septate; dikaryon |
aThe formally named groups within the chytrids and Zygomycota are each thought to be monophyletic, but their relationships to one another (and to microsporidia) are not yet well resolved. | ||