Technical Abstract: A web page for the fungal Phylum Zygomycota was prepared for the Tree of Life Web Project (ToL) at http://tolweb.org/tree/. The page contains an introduction to the group, illustrating characteristics that place this group within the true Fungi together with those that distinguish its members from other fungal phyla. Diagnostic asexual reproductive structures such as sporangia, sporangiola and merosporangia are defined and illustrated using scanning electron micrographs and/or light micrographs. Similarly, diagnostic sexual reproductive structures are illustrated using scanning electron micrographs. In addition, a generalized life cycle is provided to illustrate how the asexual and sexual cycles are integrated. An up-to-date discussion of phylogenetic relationships is provided together with a selected list of the most relevant literature references as well as links to additional information on the Internet.