This valuable catalog lists all family-group (family, subfamily, tribe, subtribe) and genus-group (generic or subgeneric) names that have been proposed for the Ephemeroptera, both recent and fossil, including the hierarchical classification of the order. The first part illustrates the hierarchical classification of the Ephemeroptera. The second part is an alphabetical list of all family-group names proposed for Ephemeroptera, while the third part consists of an alphabetical catalog of all genus-group names that have been proposed.