Zygomycota, or zygote fungi, are a phylum of fungi. The name of the phylum comes from zygosporangia, where resistant spherical spores are formed during sexual reproduction. Approximately 600 species of zygomycetes are known. They are mostly terrestrial in habitat, living in soil or on decaying plant or animal material. Zygomycete hyphae may be coenocytic, forming septa only where gametes are formed or to wall off dead hyphae.