Aulacodiscus australiensis Hustedt in Schmidt et al., 1959 (original description)
Triceratium capitiferum Hustedt in Schmidt et al., 1959 (original description)
Triceratium crispulum Hustedt in Schmidt et al., 1959 (original description)
Triceratium demissum Hustedt in Schmidt et al., 1959 (original description)
Triceratium gracillimum Hustedt in Schmidt et al., 1959 (original description)
Triceratium haitianum Hustedt in Schmidt et al., 1959 (original description)
Triceratium luculentum Hustedt in Schmidt et al., 1959 (original description)
Triceratium mamillanum Debes ex Hustedt in Schmidt et al., 1959 (original description)
Triceratium multifrons f. constricta Schultze ex Hustedt in Schmidt et al., 1959 (original description)
Triceratium multifrons f. stricta Hustedt in Schmidt et al., 1959 (original description)
Triceratium obtusangulum Hustedt in Schmidt et al., 1959 (original description)
Triceratium officiosum Hustedt in Schmidt et al., 1959 (original description)
Triceratium pulchrum Hustedt in Schmidt et al., 1959 (original description)
Triceratium sentum f. maior Hustedt in Schmidt et al., 1959 (original description)
Triceratium simile Hustedt in Schmidt et al., 1959 (original description)
Triceratium sparsipunctatum Hustedt in Schmidt et al., 1959 (original description)
Triceratium splendidum Hustedt in Schmidt et al., 1959 (original description)
Triceratium subofficiosum Hustedt in Schmidt et al., 1959 (original description)
Triceratium taeniatum Hustedt in Schmidt et al., 1959 (original description)
Triceratium udiensis Hustedt in Schmidt et al., 1959 (original description)
Triceratium venulosum f. quadrata Hustedt in Schmidt et al., 1959 (original description)
Triceratium verecundum Hustedt in Schmidt et al., 1959 (original description)
Triceratium veterarium Hustedt in Schmidt et al., 1959 (original description)
Triceratium vetustum Hustedt in Schmidt et al., 1959 (original description)
Trigonium abyssorum (Grunow in Van Heurck) Hustedt in Schmidt et al., 1959 accepted as Triceratium abyssorum var. abyssorum Grunow in Van Heurck, 1883 (new combination reference)
Trigonium capitiferum Hustedt in Schmidt et al., 1959 (original description)
Trigonium cariosum (Castracane) Hustedt in Schmidt et al., 1959 accepted as Triceratium cariosum Castracane, 1886 (new combination reference)
Trigonium crenulatum (Grove & Sturt) Hustedt in Schmidt et al., 1959 accepted as Triceratium crenulatum f. crenulatum Grove & Sturt, 1887 (new combination reference)
Trigonium cucullatum (Pantocsek) Hustedt in Schmidt et al., 1959 accepted as Triceratium cucullatum var. cucullatum Pantocsek, 1889 (new combination reference)
Trigonium demissum Hustedt in Schmidt et al., 1959 (original description)
Trigonium dobreeanum (G.Norman ex Greville) Hustedt, 1959 accepted as Triceratium dobreeanum var. dobreeanum Norman ex Greville, 1865 (new combination reference)
Trigonium glandarium (Schmidt in Schmidt et al.) Hustedt in Schmidt et al., 1959 accepted as Triceratium glandarium Schmidt in Schmidt et al., 1888 (new combination reference)
Trigonium glandiferum (Grunow) Hustedt, 1959 accepted as Triceratium glandiferum Grunow, 1888 (new combination reference)
Trigonium gracillimum Hustedt in Schmidt et al., 1959 (original description)
Trigonium haitianum Hustedt in Schmidt et al., 1959 (original description)
Trigonium inelegans var. yucatensis (Grunow in Van Heurck) Hustedt in Schmidt et al., 1959 (new combination reference)
Trigonium lautourianum (Grove ex Tempère) Hustedt in Schmidt et al., 1959 accepted as Triceratium lautourianum Grove in Bergon et al., 1890 (new combination reference)
Trigonium lineatum var. lineatum Hustedt in Schmidt et al., 1959 (original description)
Trigonium lineatum var. taeniatum Hustedt in Schmidt et al., 1959 (original description)
Trigonium luculentum Hustedt in Schmidt et al., 1959 (original description)
Trigonium mamillanum Debes ex Hustedt in Schmidt et al., 1959 (original description)
Trigonium mammiferum (Grunow in Van Heurck) Hustedt in Schmidt et al., 1959 accepted as Triceratium mammiferum f. mammiferum Grunow in Van Heurck, 1883 (new combination reference)
Trigonium multifrons f. constricta Schultze ex Hustedt in Schmidt et al., 1959 (original description)
Trigonium multifrons f. multifrons (Brun in Brun & Tempère) Hustedt in Schmidt et al., 1959 accepted as Triceratium multifrons f. multifrons Brun in Brun & Tempère, 1889 (new combination reference)
Trigonium obtusangulum Hustedt in Schmidt et al., 1959 (original description)
Trigonium officiosum Hustedt in Schmidt et al., 1959 (original description)
Trigonium pilchrum Hustedt in Schmidt et al., 1959 (original description)
Trigonium propium (Pantocsek) Hustedt in Schmidt et al., 1959 accepted as Triceratium proprium Pantocsek, 1892 (new combination reference)
Trigonium quadratum (Greville) Hustedt in Schmidt et al., 1959 accepted as Triceratium quadratum R.K.Greville, 1865 † accepted as Entogoniopsis lineolata (R.K.Greville) J.Witkowski, P.A.Sims, N.I.Strelnikova & D.M.Williams, 2015 † (new combination reference)
Trigonium radiopunctatum (Schmidt in Schmidt et al.) Hustedt in Schmidt et al., 1959 (new combination reference)
Trigonium sentum (Witt in Schmidt et al.) Hustedt in Schmidt et al., 1959 accepted as Triceratium sentum f. sentum Witt in Schmidt et al., 1890 (new combination reference)
Trigonium sparsipunctatum Hustedt in Schmidt et al., 1959 (original description)
Trigonium subcapitatum (Greville) Hustedt in Schmidt et al., 1959 accepted as Triceratium subcapitatum var. subcapitatum Greville, 1863 (new combination reference)
Trigonium subofficiosum Hustedt in Schmidt et al., 1959 (original description)
Trigonium taeniatum Hustedt in Schmidt et al., 1959 (original description)
Trigonium udiensis Hustedt in Schmidt et al., 1959 (original description)
Trigonium undatum (Grunow) Hustedt in Schmidt et al., 1959 accepted as Triceratium undatum Grunow, 1887 (new combination reference)
Trigonium venulosum f. quadrata Hustedt in Schmidt et al., 1959 (original description)
Trigonium verecundum Hustedt in Schmidt et al., 1959 (original description)
Trigonium veterarium Hustedt in Schmidt et al., 1959 (original description)
Trigonium vetustum Hustedt in Schmidt et al., 1959 (original description)
Trigonium wetzelii (Hustedt in Wetzel) Hustedt in Schmidt et al., 1959 accepted as Triceratium wetzelii Hustedt ex Wetzel, 1935 (new combination reference)
Trinacria crispulum Hustedt in Schmidt et al., 1959 (original description)
Trinacria simile Hustedt in Schmidt et al., 1959 (original description)
Trinacria splendidum Hustedt in Schmidt et al., 1959 (original description)