Arcaechinus Kier, 1957 † accepted as Archaechinus Kier, 1957 † (original description)
Asyrinxia Campbell, 1957 † (original description)
Balanoconcha Campbell, 1957 † (original description)
Bighornia Duncan, 1957 † (original description)
Brightonia Kier, 1957 † (original description)
Craginites Young, 1957 † (original description)
Discotrypella Elias, 1957 † (original description)
Drakeoceras Young, 1957 † (original description)
Ectochoristites Campbell, 1957 † (original description)
Fenesteverta Elias, 1957 † (original description)
Granuliferella Zeller, 1957 † (original description)
Hadrokkosaurus Welles, 1958 † (original description)
Henryhowella Puri, 1957 (original description)
Hilgardella Stephenson, 1957 † (original description)
Hintzeia Harrington, 1957 † (original description)
Iowanella Thompson, 1957 † (original description)
Kanoshia Harrington, 1957 † (original description)
Leviechinus Kier, 1957 † (original description)
Loxopeltis Rasetti, 1957 † (original description)
Niobrarateuthis Miller, 1957 † (original description)
Onchocephalites Rasetti, 1957 † (original description)
Parapoulsenia Rasetti, 1957 † (original description)
Pliomeraspis Harrington, 1957 † (original description)
Protocitta Brodkorb, 1957 † (original description)
Protopliomerella Harrington, 1957 † (original description)
Pteraichnus Stokes, 1957 † (original description)
Rossaspis Harrington, 1957 † (original description)
Springeria Elias, 1957 † (original description)
Stillina Laurencich, 1957 † (original description)
Strebloplax Elias, 1957 † (original description)
Tachycineta Brodkorb, 1957 † (original description)
Unispirifer Campbell, 1957 † (original description)
Werriea Campbell, 1957 † accepted as Orthotetes Fischer, 1829 † (original description)