Amecephalus Walcott, 1924 † (original description)
Anoria Walcott, 1924 † (original description)
Armonia Walcott, 1924 † (original description)
Bellefontia Walcott, 1924 † (original description)
Burnetia Walcott, 1924 † accepted as Burnetiella Lochman, 1958 † (original description)
Bynumia Walcott, 1924 † (original description)
Cedaria Walcott, 1924 † (original description)
Chancia Walcott, 1924 † (original description)
Corbinia Walcott, 1924 † (original description)
Crusola Walcott, 1924 † (original description)
Dunderbergia Walcott, 1924 † (original description)
Elkia Walcott, 1924 † (original description)
Elrathia Walcott, 1924 † (original description)
Elvinia Walcott, 1924 † (original description)
Eurekia Walcott, 1924 † (original description)
Hardyia Walcott, 1924 † (original description)
Holteria Walcott, 1924 † (original description)
Idahoia Walcott, 1924 † (original description)
Iddingsia Walcott, 1924 † (original description)
Irvingella Walcott, 1924 † (original description)
Kingstonia Walcott, 1924 † (original description)
Modicia Walcott, 1924 † (original description)
Moosia Walcott, 1924 † (original description)
Moxomia Walcott, 1924 † (extant flag source)
Moxomia Walcott, 1924 † (original description)
Taenicephalus Walcott, 1924 † (extant flag source)
Tostonia Walcott, 1924 † (original description)
Ucebia Walcott, 1924 † (original description)
Ucebia Walcott, 1924 † (extant flag source)
Utia Walcott, 1924 † (extant flag source)
Wilbernia Walcott, 1924 † (extant flag source)
Xenostegium Walcott, 1924 † (original description)
Xenostegium Walcott, 1924 † (extant flag source)