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| Triceratium venulosum f. quadrata Hustedt in Schmidt et al. 1959 |
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| Triceratium verecundum Hustedt in Schmidt et al. 1959 |
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| Triceratium veterarium Hustedt in Schmidt et al. 1959 |
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| Triceratium vetustum Hustedt in Schmidt et al. 1959 |
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| Trigonium abyssorum (Grunow in Van Heurck) Hustedt in Schmidt et al. 1959 |
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| Trigonium capitiferum Hustedt in Schmidt et al. 1959 |
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| Trigonium cariosum (Castracane) Hustedt in Schmidt et al. 1959 |
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| Trigonium crenulatum (Grove & Sturt) Hustedt in Schmidt et al. 1959 |
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| Trigonium cucullatum (Pantocsek) Hustedt in Schmidt et al. 1959 |
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| Trigonium demissum Hustedt in Schmidt et al. 1959 |
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| Trigonium dobreeanum (Norman ex Greville) Hustedt in Schmidt et al. 1959 |
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| Trigonium glandarium (Schmidt in Schmidt et al.) Hustedt in Schmidt et al. 1959 |
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| Trigonium glandiferum (Grunow in Schmidt et al.) Hustedt in Schmidt et al. 1959 |
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| Trigonium gracillimum Hustedt in Schmidt et al. 1959 |
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| Trigonium haitianum Hustedt in Schmidt et al. 1959 |
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| Trigonium inelegans var. yucatensis (Grunow in Van Heurck) Hustedt in Schmidt et al. 1959 |
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| Trigonium lahuseni (Pantocsek) Hustedt in Schmidt et al. 1959 |
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| Trigonium lautourianum (Grove ex Tempère) Hustedt in Schmidt et al. 1959 |
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| Trigonium lineatum Hustedt in Schmidt et al. 1959 |
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| Trigonium lineatum var. taeniatum Hustedt in Schmidt et al. 1959 |
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