Phylogeny
The Zygomycota are generally placed near the base of the fungal phylogenetic tree, having diverged from other fungi after chytrids.
Molecular phylogenetics reveals that they form a polyphyletic group and could see a split into several new phyla.
The order Glomales was removed in 2001 and elevated to Division (or phylum) Glomeromycota due to their lack of zygospore formation, mycorrhizal habit, and lack of DNA sequence homology.
Read more about this topic: Zygomycota