Type species: Pachydictya robusta Ulrich, 1882
This genus includes the species:
| Pachydictya angusticellata | Astrova, 1965 | M. Ordovician | Russia |
| Pachydictya bifurcata | (Hall, 1883) | Ordovician | USA |
| Pachydictya bifurcata instabilis | Foerste, 1887 | Silurian (Llandovery) | USA (Ohio) |
| Pachydictya bromidensis | Loeblich, 1942 | Ordovician (Caradoc) | USA (Oklahoma) |
| Pachydictya copiosa | Astrova, 1965 | M. Ordovician | Russia |
| Pachydictya coxi | Oakley, 1938 | Ordovician (Caradoc) | Canada |
| Pachydictya cyclostomoides | (Eichwald, 1855) | Ordovician | USA |
| Pachydictya cystiphragma | Astrova, 1965 | M. Ordovician | Russia |
| Pachydictya dichotoma | Nekhoroshev, 1955 | Silurian (Llandovery) | Russia |
| Pachydictya emaciata | Foerste, 1887 | Silurian (Llandovery) | USA (Ohio) |
| Pachydictya emarcescens | Foerste, 1889 | Silurian (Llandovery) | USA (Ohio) |
| Pachydictya everetti | Ulrich, 1890 | Ordovician (Caradoc) | USA, Mongolia |
| Pachydictya everettiformis | Astrova, 1965 | M. Ordovician | Russia |
| Pachydictya firma | Ulrich, 1890 | Ordovician (Ashgill) | USA, Canada |
| Pachydictya? famelica | (Foerste, 1889) | Silurian (Llandovery) | USA (Ohio) |
| Pachydictya flabellum | (Leuchtenberg in Eichwald, 1855) | Ordovician (Caradoc) | Russia, Estonia, Belarus |
| Pachydictya hexagonalis | Ulrich, 1889 | Ordovician, Silurian | Canda |
| Pachydictya kuckersensis | Bekker, 1919 | Ordovician | USA |
| Pachydictya magnipora | Ulrich, 1889 | Ordovician (Caradoc) | USA, Canada |
| Pachydictya meneghinii | Vinassa de Regny, 1942 | Ordovician (Caradoc) | Italy (Sardinia) |
| Pachydictya miranda | Astrova, 1965 | M. Ordovician | Russia |
| Pachydictya pectinata | Nekhorosheva, 1970 | Ordovician (Ashgill) | Russia |
| Pachydictya robusta | Ulrich, 1882 | Ordovician (Caradoc) | USA (Tennessee) |
| Pachydictya? sardoa | Vinassa de Regny, 1942 | Ordovician | Italy |
| Pachydictya senilis | Coryell, 1921 | Ordovician | USA (Tennessee) |
| Pachydictya sheldonensis | Ross, 1963 | Ordovician | USA (Vermont) |
| Pachydictya splendens | Ulrich, 1890 | Ordovician (Ashgill) | USA (Illinois) |
| Pachydictya uralica | Astrova, 1965 | Ordovician | USA |
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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