Neithea vicinalis Stoyanow, 1949 † (original description)
Trigonia cragini Stoyanow, 1949 † accepted as Sonoragonia cragini (Stoyanow, 1949) † (original description)
Trigonia dumblei Stoyanow, 1949 † accepted as Cochisella dumblei (Stoyanow, 1949) † (original description)
Trigonia guildi Stoyanow, 1949 † accepted as Cochisella guildi (Stoyanow, 1949) † (original description)
Trigonia kitchini Stoyanow, 1949 † accepted as Sonoragonia scotti M. R. Cooper, 2021 † (original description)
Trigonia maloneana Stoyanow, 1949 † accepted as Stoyanowella maloneana (Stoyanow, 1949) † (original description)
Trigonia mearnsi Stoyanow, 1949 † accepted as Cochisella mearnsi (Stoyanow, 1949) † (original description)
Trigonia reesidei Stoyanow, 1949 † accepted as Buchotrigonia reesidei (Stoyanow, 1949) † (original description)
Trigonia resoluta Stoyanow, 1949 † accepted as Cochisella resoluta (Stoyanow, 1949) † (original description)
Trigonia saavedra Stoyanow, 1949 † accepted as Cochisella saavedra (Stoyanow, 1949) † (original description)
Trigonia weaveri Stoyanow, 1949 † accepted as Tanzanitrigonia weaveri (Stoyanow, 1949) † (original description)