Balaklavella M. R. Cooper, 2015 † (original description)
Balaklavella balaklavensis (Yanin, 2004) † (basis of record)
Balaklavella yanini M. R. Cooper, 2015 † (original description)
Earlpackardia M. R. Cooper, 2015 † (original description)
Earlpackardia amagensis (T. Kobayashi, 1957) † (basis of record)
Earlpackardia jacksonensis (E. L. Packard, 1921) † (basis of record)
Earlpackardia yeharai (T. Kobayashi, 1954) † (basis of record)
Elianella M. R. Cooper, 2015 † accepted as Elianegonia Ceccolini & Cianferoni, 2021 † (original description)
Erichlangeia M. R. Cooper, 2015 † (original description)
Erichlangeia dietrichi (E. Lange, 1914) † (basis of record)
Jaitlygonia M. R. Cooper, 2015 † (original description)
Jaitlygonia indica (Stoliczka, 1871) † (basis of record)
Jaitlygonia orientalis (Forbes, 1845) † (basis of record)
Jaitlygonia suborbicularis (Forbes, 1845) † (basis of record)
Levantotrigonia M. Nakano, 1977 † (additional source)
Levantotrigonia lewisi (Blanckenhorn, 1890) † (basis of record)
Levantotrigonia magharensis (Abbass, 1962) † accepted as Valenciella magharensis (Abbass, 1962) † (basis of record)
Lycettitrigonia M. R. Cooper, 2015 † (original description)
Lycettitrigonia M. R. Cooper, 2015 † (basis of record)
Lycettitrigonia affinis (J. Sowerby, 1818) † (basis of record)
Lycettitrigonia analoga (Douvillé, 1916) † accepted as Valenciella analoga (Douvillé, 1916) † (additional source)
Lycettitrigonia boloniensis (de Loriol, 1866) † (basis of record)
Lycettitrigonia coquandiana (A. d'Orbigny, 1844) † (basis of record)
Lycettitrigonia costatissima (Petter-Receveur, 1955) † (basis of record)
Lycettitrigonia debilis (Lycett, 1877) † (basis of record)
Lycettitrigonia depauperata (Douvillé, 1916) † accepted as Valenciella depauperata (Douvillé, 1916) † (additional source)
Lycettitrigonia eccentrica (Parkinson, 1811) † (basis of record)
Lycettitrigonia excentrica [sic] † accepted as Lycettitrigonia eccentrica (Parkinson, 1811) † (basis of record)
Lycettitrigonia laeviuscula (Lycett, 1875) † (basis of record)
Lycettitrigonia lerchi (R. T. Hill, 1893) † (basis of record)
Lycettitrigonia longa (Agassiz, 1840) † (basis of record)
Lycettitrigonia pseudoexcentrica (Hoppe, 1922) † (basis of record)
Lycettitrigonia semiculta (Forbes, 1845) † (basis of record)
Lycettitrigonia undulatocostata (Blanckenhorn, 1890) † accepted as Valenciella undulatocostata (Blanckenhorn, 1890) † (additional source)
Lycettitrigonia undulatoplicata [sic] † accepted as Lycettitrigonia undulatocostata (Blanckenhorn, 1890) † accepted as Valenciella undulatocostata (Blanckenhorn, 1890) † (basis of record)
Megatrigonia (Rutitrigonia) nossae Aitken, 1961 † accepted as Tanzanitrigonia nossae (Aitken, 1961) † (basis of record)
Megatrigonia (Rutitrigonia) nyangensis Aitken, 1961 † accepted as Tanzanitrigonia nyangensis (Aitken, 1961) † (basis of record)
Megatrigonia (Rutitrigonia) turikirae Aitken, 1961 † accepted as Turikirella turikirae (Aitken, 1961) † (basis of record)
Pholadomya lerchi R. T. Hill, 1893 † accepted as Lycettitrigonia lerchi (R. T. Hill, 1893) † (basis of record)
Rutitrigonia amagensis T. Kobayashi, 1957 † accepted as Earlpackardia amagensis (T. Kobayashi, 1957) † (basis of record)
Rutitrigonia balaklavensis Yanin, 2004 † accepted as Balaklavella balaklavensis (Yanin, 2004) † (basis of record)
Rutitrigonia yeharai T. Kobayashi, 1954 † accepted as Earlpackardia yeharai (T. Kobayashi, 1954) † (basis of record)
Tanzanitrigonia M. R. Cooper, 2015 † (original description)
Tanzanitrigonia niongalensis (E. Lange, 1914) † (basis of record)
Tanzanitrigonia nossae (Aitken, 1961) † (basis of record)
Tanzanitrigonia nyangensis (Aitken, 1961) † (basis of record)
Tanzanitrigonia schwarzi (G. Müller, 1900) † (basis of record)
Tanzanitrigonia stefaninii (Venzo, 1942) † (basis of record)
Tanzanitrigonia stephaninii [sic] † accepted as Tanzanitrigonia stefaninii (Venzo, 1942) † (basis of record)
Tanzanitrigonia undulatostriata (Paulcke, 1903) † (basis of record)
Trigonia (Rutitrigonia) pongolensis Rennie, 1936 † accepted as Zulutrigonia pongolensis (Rennie, 1936) † (basis of record)
Trigonia affinis J. Sowerby, 1818 † accepted as Lycettitrigonia affinis (J. Sowerby, 1818) † (basis of record)
Trigonia analoga Douvillé, 1916 † accepted as Valenciella analoga (Douvillé, 1916) † (basis of record)
Trigonia beyrichi Krumbeck, 1906 † accepted as Lycettitrigonia beyrichi (Krumbeck, 1906) † (basis of record)
Trigonia boloniensis de Loriol, 1866 † accepted as Lycettitrigonia boloniensis (de Loriol, 1866) † (basis of record)
Trigonia coquandiana A. d'Orbigny, 1844 † accepted as Lycettitrigonia coquandiana (A. d'Orbigny, 1844) † (basis of record)
Trigonia debilis Lycett, 1877 † accepted as Lycettitrigonia debilis (Lycett, 1877) † (basis of record)
Trigonia depauperata Douvillé, 1916 † accepted as Valenciella depauperata (Douvillé, 1916) † (basis of record)
Trigonia dietrichi E. Lange, 1914 † accepted as Erichlangeia dietrichi (E. Lange, 1914) † (basis of record)
Trigonia dunscombensis Lycett, 1877 † accepted as Lycettitrigonia dunscombensis (Lycett, 1877) † (basis of record)
Trigonia eccentrica Parkinson, 1811 † accepted as Lycettitrigonia eccentrica (Parkinson, 1811) † (basis of record)
Trigonia indica Stoliczka, 1871 † accepted as Jaitlygonia indica (Stoliczka, 1871) † (basis of record)
Trigonia jacksonensis E. L. Packard, 1921 † accepted as Earlpackardia jacksonensis (E. L. Packard, 1921) † (basis of record)
Trigonia janenschi E. Lange, 1914 † accepted as Turikirella janenschi (E. Lange, 1914) † (basis of record)
Trigonia laeviuscula Lycett, 1875 † accepted as Lycettitrigonia laeviuscula (Lycett, 1875) † (basis of record)
Trigonia lajoyei Leymerie, 1842 † accepted as Lycettitrigonia longa (Agassiz, 1840) † (basis of record)
Trigonia longa Agassiz, 1840 † accepted as Lycettitrigonia longa (Agassiz, 1840) † (basis of record)
Trigonia longa var. undulatostriata Paulcke, 1903 † accepted as Tanzanitrigonia undulatostriata (Paulcke, 1903) † (basis of record)
Trigonia magharensis Abbass, 1962 † accepted as Levantotrigonia magharensis (Abbass, 1962) † accepted as Valenciella magharensis (Abbass, 1962) † (basis of record)
Trigonia neumayri Yehara, 1923 † accepted as Rutitrigonia yeharai T. Kobayashi, 1954 † accepted as Earlpackardia yeharai (T. Kobayashi, 1954) † (basis of record)
Trigonia niongalensis E. Lange, 1914 † accepted as Tanzanitrigonia niongalensis (E. Lange, 1914) † (basis of record)
Trigonia orientalis Forbes, 1845 † accepted as Jaitlygonia orientalis (Forbes, 1845) † (basis of record)
Trigonia picteti Coquand, 1863 † accepted as Zulutrigonia picteti (Coquand, 1863) † accepted as Valenciella picteti (Coquand, 1863) † (basis of record)
Trigonia pseudoindica Arkhanguelsky, 1916 † accepted as Turanigonia pseudoindica (Arkhanguelsky, 1916) † (basis of record)
Trigonia sanctaecrucis Pictet & Campiche, 1866 † accepted as Lycettitrigonia sanctaecrucis (Pictet & Campiche, 1866) † (basis of record)
Trigonia schwarzi G. Müller, 1900 † accepted as Tanzanitrigonia schwarzi (G. Müller, 1900) † (basis of record)
Trigonia semiculta Forbes, 1845 † accepted as Lycettitrigonia semiculta (Forbes, 1845) † (basis of record)
Trigonia suborbicularis Forbes, 1845 † accepted as Jaitlygonia suborbicularis (Forbes, 1845) † (basis of record)
Trigonia undulatocostata Blanckenhorn, 1890 † accepted as Lycettitrigonia undulatocostata (Blanckenhorn, 1890) † accepted as Valenciella undulatocostata (Blanckenhorn, 1890) † (basis of record)
Trigonia weaveri Stoyanow, 1949 † accepted as Tanzanitrigonia weaveri (Stoyanow, 1949) † (basis of record)
Turanigonia M. R. Cooper, 2015 † (original description)
Turanigonia pseudoindica (Arkhanguelsky, 1916) † (basis of record)
Turikirella M. R. Cooper, 2015 † (original description)
Turikirella janenschi (E. Lange, 1914) † (basis of record)
Turikirella turikirae (Aitken, 1961) † (basis of record)
Zulutrigonia M. R. Cooper, 1990 † (basis of record)
Zulutrigonia kikombona (Aitken, 1961) † (basis of record)
Zulutrigonia krenkeli (E. Lange, 1914) † (basis of record)
Zulutrigonia picteti (Coquand, 1863) † accepted as Valenciella picteti (Coquand, 1863) † (basis of record)
Zulutrigonia pongolensis (Rennie, 1936) † (basis of record)