Type species: Pachydictya conciliatrix Ulrich, 1886
| Synonyms | Author | Type Species |
|---|---|---|
| Astreptodictya | Karklins, 1969 | Pachydictya acuta Hall, 1847 |
This genus includes the species:
| Trigonodictya acuta | (Hall, 1847) | Ordovician | USA |
| Trigonodictya acuta manniensis | (Ross, 1964) | Ordovician (Caradoc) | USA (New York) |
| Trigonodictya acuta minor | (Ross, 1964) | Ordovician (Caradoc) | USA (New York) |
| Trigonodictya acuta tabulata | (Ross, 1964) | Ordovician (Caradoc) | USA (New York) |
| Trigonodictya acuta tristolone | (Ross, 1964) | Ordovician (Caradoc) | USA (New York) |
| Trigonodictya ambigua | (Ross, 1961) | Ordovician Silurian |
Canada, Russia Canada, Estonia |
| Trigonodictya bifurcata | (Hall, 1883) | Ordovician Silurian |
Sweden, Estonia USA |
| Trigonodictya cirrita | Karklins, 1983 | Ordovician (Caradoc) | USA (Kentucky) |
| Trigonodictya conciliatrix | (Ulrich, 1886) | Ordovician (Caradoc) | USA (Minnesota) |
| Trigonodictya elegans | (Ulrich, 1893) | Ordovician | USA, Estonia, Sweden, Poland |
| Trigonodictya fenestelliformis | (Nicholson, 1875) | Ordovician (Ashgill) | USA, Canada |
| Trigonodictya fenestelliformis corticula | (Ulrich, 1890) | Ordovician (Ashgill) | USA (Illinois) |
| Trigonodictya fimbriata | (Ulrich, 1886) | Ordovician (Caradoc) | USA Minnesota |
| Trigonodictya gigantea | (Ulrich, 1890) | Ordovician (Ashgill) | USA (Illinois) |
| Trigonodictya irregularis | Coryell, 1921 | Ordovician (Caradoc) | USA (Tennessee) |
| Trigonodictya obesa | (Foerste, 1887) | Silurian (Llandovery) | USA (Ohio) |
| Trigonodictya occidentalis | (Ulrich, 1886) | Ordovician (Caradoc) | USA (Minnesota) |
| Trigonodictya pumila | (Ulrich, 1890) | Ordovician | USA (Minnesota), Russia |
| Trigonodictya triserialis | (Ulrich, 1890) | Ordovician (Caradoc) | Canada |
| Trigonodictya turgida | (Foerste, 1887) | Silurian (Llandovery) | USA (Ohio) |
This information is based upon various sources, but no personal knowledge. I am indebted to the late Alan Horowitz for his compilation, and to Dr. J. Pachut.
I would be grateful for corrections to, or critical reviews of this information. This is not a 'final' version (an impossible ideal), but a working document.
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