Anomalorthidae Ulrich & Cooper, 1936 † (original description)
Anomalorthis Ulrich & Cooper, 1936 † (original description)
Anomalorthis utahensis Ulrich & Cooper, 1936 † (original description)
Aporthophyla Ulrich & Cooper, 1936 † (original description)
Aporthophyla typa Ulrich & Cooper, 1936 † (original description)
Eostrophiidae Ulrich & Cooper, 1936 † (original description)
Goniotrema Ulrich & Cooper, 1936 † (original description)
Hesperonomia Ulrich & Cooper, 1936 † (original description)
Hesperonomia planidorsalis Ulrich & Cooper, 1936 † (original description)
Hesperonomiidae Ulrich & Cooper, 1936 † (original description)
Leptellina Ulrich & Cooper, 1936 † (original description)
Leptellinidae Ulrich & Cooper, 1936 † (original description)
Orthidiella Ulrich & Cooper, 1936 † (original description)
Orthidiella longwelli Ulrich & Cooper, 1936 † (original description)
Orthidiellidae Ulrich & Cooper, 1936 † (original description)
Syntrophiidina † (original description)
Tetralobulidae Ulrich & Cooper, 1936 † (original description)