Grypolithax Kellogg, 1931 (original description)
Lamprolithax Kellogg, 1931 † (original description)
Liolithax Kellogg, 1931 † (original description)
Loxolithax Kellogg, 1931 † (original description)
Nannolithax Kellogg, 1931 † (original description)
Neotherium Kellogg, 1931 † (original description)
Oedolithax Kellogg, 1931 † (original description)
Peripolocetus Kellogg, 1931 (original description)
Platylithax Kellogg, 1931 † (original description)
Presbychen Wetmore, 1930 (original description)
Tiphyocetus Kellogg, 1931 † (original description)