Apiotrigonia (Apiotrigonia) mikasaensis Tashiro, 1979 † accepted as Maedagonia mikasaensis (Tashiro, 1979) † (basis of record)
Apiotrigonia ashizawaensis Saito, 1962 † accepted as Maedagonia ashizawaensis (Saito, 1962) † (basis of record)
Apiotrigonia costigera (Lycett, 1979) † (basis of record)
Apiotrigonia crassoradiata M. Nakano, 1957 † accepted as Maedagonia crassoradiata (M. Nakano, 1957) † (basis of record)
Apiotrigonia flexicostata (Burwash, 1914) † (basis of record)
Apiotrigonia hetonaiana Tashiro, 1978 † accepted as Maedagonia hetonaiana (Tashiro, 1978) † (basis of record)
Apiotrigonia jimboi M. Nakano, 1957 † accepted as Maedagonia jimboi (M. Nakano, 1957) † (basis of record)
Apiotrigonia levinae Pojarkova, 1990 † accepted as Sokolovskya levinae (Pojarkova, 1990) † (basis of record)
Apiotrigonia maudensis (Whiteaves, 1884) † (basis of record)
Apiotrigonia nereis (A. d'Orbigny, 1850) † (basis of record)
Apiotrigonia obliquecostata M. Nakano, 1957 † accepted as Maedagonia obliquecostata (M. Nakano, 1957) † (basis of record)
Apiotrigonia obsoleta M. Nakano, 1957 † accepted as Maedagonia obsoleta (M. Nakano, 1957) † (basis of record)
Apiotrigonia pennata (J. Sowerby, 1819) † (basis of record)
Apiotrigonia postonodosa M. Nakano, 1957 † accepted as Nuraya postonodosa (M. Nakano, 1957) † (basis of record)
Apiotrigonia sulcataria (Lamarck, 1819) † (basis of record)
Apiotrigonia tuberculata M. Nakano, 1957 † accepted as Nuraya amanoi (M. Nakano, 1957) † (basis of record)
Apiotrigonia undulosa M. Nakano, 1957 † accepted as Maedagonia undulosa (M. Nakano, 1957) † (basis of record)
Apiotrigonia utoensis Tashiro, 1972 † accepted as Maedagonia utoensis (Tashiro, 1972) † (basis of record)
Bohemigonia M. R. Cooper, 2021 † (original description)
Bohemigonia debuchii (Geinitz, 1840) † (basis of record)
Bohemigonia frici M. R. Cooper, 2021 † (original description)
Dorbigonia M. R. Cooper, 2021 † (original description)
Dorbigonia disparilis (A. d'Orbigny, 1844) † (basis of record)
Goniomya calderoni Castillo & Aguilera, 1895 † accepted as Lambertrigonia calderoni (Castillo & Aguilera, 1895) † (basis of record)
Heterotrigonia diversicostata (Whiteaves, 1876) † (basis of record)
Heterotrigonia himenourensis Tashiro, 1972 † accepted as Nakanotrigonia himenourensis (Tashiro, 1972) † (basis of record)
Himenourella M. R. Cooper, 2021 † (original description)
Himenourella jimbonis (Strand, 1928) † (basis of record)
Himenourella sawatai (Yehara, 1923) † (basis of record)
Himenourella subjimboi (Miroljubov, 1965) † (basis of record)
Himenourella subovalis (Jimbo, 1894) † (basis of record)
Kushmurunskya M. R. Cooper, 2021 † (original description)
Kushmurunskya gladkowskii (Shheglova-Borodina, 1960) † (basis of record)
Kyzylkumgonia M. R. Cooper, 2021 † (original description)
Kyzylkumgonia syrdariensis (Arkhanguelsky, 1916) † (basis of record)
Kyzylkumgonia tagamensis (Belyakova, 1980) † (basis of record)
Kyzylkumgonia turcmenensis (Arkhanguelsky, 1916) † (basis of record)
Lambertrigonia calderoni (Castillo & Aguilera, 1895) † (basis of record)
Lyrodon sulcatum Goldfuss, 1837 † accepted as Apiotrigonia sulcataria (Lamarck, 1819) † (basis of record)
Maedagonia M. R. Cooper, 2021 † (original description)
Maedagonia ashizawaensis (Saito, 1962) † (basis of record)
Maedagonia crassoradiata (M. Nakano, 1957) † (basis of record)
Maedagonia futabaensis (Maeda & Kawabe, 1967) † (basis of record)
Maedagonia hetonaiana (Tashiro, 1978) † (basis of record)
Maedagonia hironoensis (Maeda & Kawabe, 1967) † (basis of record)
Maedagonia jimboi (M. Nakano, 1957) † (basis of record)
Maedagonia mikasaensis (Tashiro, 1979) † (new combination reference)
Maedagonia obliquecostata (M. Nakano, 1957) † (basis of record)
Maedagonia obsoleta (M. Nakano, 1957) † (basis of record)
Maedagonia orikiensis (Maeda & Kawabe, 1967) † (basis of record)
Maedagonia undulosa (M. Nakano, 1957) † (basis of record)
Maedagonia utoensis (Tashiro, 1972) † (basis of record)
Maedagonia yabei M. R. Cooper, 2021 † (original description)
Matsudagonia M. R. Cooper, 2021 † (original description)
Matsudagonia dubia (Tashiro, 1979) † (basis of record)
Microtrigonia amanoi M. Nakano, 1957 † accepted as Nuraya amanoi (M. Nakano, 1957) † (basis of record)
Microtrigonia imutensis Tashiro, 1972 † accepted as Nuraya imutensis (Tashiro, 1972) † (basis of record)
Microtrigonia minima M. Nakano, 1957 † accepted as Nuraya minima (M. Nakano, 1957) † (basis of record)
Nakanotrigonia granosa (M. Nakano, 1957) † (basis of record)
Nakanotrigonia himenourensis (Tashiro, 1972) † (basis of record)
Nuraya Özdikmen & Akbulut, 2010 † (basis of record)
Nuraya amanoi (M. Nakano, 1957) † (basis of record)
Nuraya imutensis (Tashiro, 1972) † (basis of record)
Nuraya minima (M. Nakano, 1957) † (basis of record)
Nuraya postonodosa (M. Nakano, 1957) † (basis of record)
Poultoniella M. R. Cooper, 2021 † (original description)
Poultoniella newcombei (E. L. Packard, 1921) † (basis of record)
Pseudapiotrigonia M. R. Cooper, 2021 † (original description)
Pseudapiotrigonia sturgisensis (Whitfield & Hovey, 1906) † (basis of record)
Pseudapiotrigonia utahensis (Imlay, 1964) † (basis of record)
Sogdianagonia S. Schneider & S. R. A. Kelly, 2019 † (basis of record)
Sokolovskya M. R. Cooper, 2021 † (original description)
Sokolovskya khoresmensis (Belyakova, 1965) † (basis of record)
Sokolovskya levinae (Pojarkova, 1990) † (new combination reference)
Sonoragonia M. R. Cooper, 2021 † (original description)
Sonoragonia cragini (Stoyanow, 1949) † (basis of record)
Sonoragonia scotti M. R. Cooper, 2021 † (original description)
Trigonia costigera Lycett, 1879 † accepted as Apiotrigonia costigera (Lycett, 1979) † (basis of record)
Trigonia cragini Stoyanow, 1949 † accepted as Sonoragonia cragini (Stoyanow, 1949) † (basis of record)
Trigonia debuchii Geinitz, 1840 † accepted as Bohemigonia debuchii (Geinitz, 1840) † (basis of record)
Trigonia disparilis A. d'Orbigny, 1844 † accepted as Dorbigonia disparilis (A. d'Orbigny, 1844) † (basis of record)
Trigonia diversicostata Whiteaves, 1876 † accepted as Heterotrigonia diversicostata (Whiteaves, 1876) † (basis of record)
Trigonia flexicostata Burwash, 1914 † accepted as Apiotrigonia flexicostata (Burwash, 1914) † (basis of record)
Trigonia jimbonis Strand, 1928 † accepted as Himenourella jimbonis (Strand, 1928) † (basis of record)
Trigonia maudensis Whiteaves, 1884 † accepted as Apiotrigonia maudensis (Whiteaves, 1884) † (basis of record)
Trigonia nereis A. d'Orbigny, 1850 † accepted as Apiotrigonia nereis (A. d'Orbigny, 1850) † (basis of record)
Trigonia newcombei E. L. Packard, 1921 † accepted as Poultoniella newcombei (E. L. Packard, 1921) † (basis of record)
Trigonia pennata J. Sowerby, 1819 † accepted as Apiotrigonia pennata (J. Sowerby, 1819) † (basis of record)
Trigonia sturgisensis Whitfield & Hovey, 1906 † accepted as Pseudapiotrigonia sturgisensis (Whitfield & Hovey, 1906) † (basis of record)
Trigonia subovalis Jimbo, 1894 † accepted as Himenourella subovalis (Jimbo, 1894) † (basis of record)
Trigonia subovalis var. minor Yabe & Nagao, 1925 † accepted as Maedagonia yabei M. R. Cooper, 2021 † (basis of record)
Trigonia syrdariensis Arkhanguelsky, 1916 † accepted as Kyzylkumgonia syrdariensis (Arkhanguelsky, 1916) † (basis of record)
Trigonia turcmenensis Arkhanguelsky, 1916 † accepted as Kyzylkumgonia turcmenensis (Arkhanguelsky, 1916) † (basis of record)
Vaugonia utahensis Imlay, 1964 † accepted as Pseudapiotrigonia utahensis (Imlay, 1964) † (basis of record)

 Nomenclature

 for Maedagonia yabei M. R. Cooper, 2021 †

nomen novum pro Trigonia subovalis var. minor Yabe & Nagao, 1925, non Trigonia minor Litschkov, 1912 [details]

 Nomenclature

 for Sonoragonia scotti M. R. Cooper, 2021 †

nomen novum pro Trigonia kitchini Stoyanow, 1949, non Trigonia kitchini E. H. L. Schwarz, 1917 nec T. kitchini ... [details]