Type species: Nicholsonella ponderosa Ulrich, 1890
This genus includes the species:
McKinney, 1971 | Ordovician Caradoc=Sandbian-Katian | USA Alabama | |
Modzalevskaya, 1977 | Ordovician Ashgill=Katian-Hirnantian | Russia Tuva | |
Kopajevich, 1984 | Ordovician Ashgill=Katian-Hirnantian | Mongolia | |
Yabe & Hayasaka, 1920 | Ordovician | China | |
Ernst & Key, 2007 | Ordovician Caradoc-Ashgill=Sandbian-Katian | France | |
Astrova, 1965 | Early Ordovician Tremadocian-Floian | Russia Novaya Zemlaya | |
Yang, 1957 | Ordovician Arenig=Floian-Dapingian | China | |
McKinney, 1971 | Ordovician Caradoc=Sandbian-Katian | USA Alabama | |
Loeblich, 1942 | Ordovician Caradoc=Sandbian-Katian | USA Oklahoma | |
Ulrich, 1893 | Ordovician Caradoc=Sandbian-Katian | USA Minnesota | |
Astrova, 1965 | Ordovician Caradoc=Sandbian-Katian | Russia Siberia | |
Rozman et al., 1970 | Late Ordovician | Russia | |
Loeblich, 1942 | Ordovician Caradoc=Sandbian-Katian | USA Oklahoma | |
Nekhorosheva, 1965 | Early Ordovician | Russia Novaya Zemlaya | |
Wilson, 1921 | Ordovician Caradoc=Sandbian-Katian | Canada Ontario | |
McKinney, 1971 | Ordovician Caradoc=Sandbian-Katian | USA Alabama | |
Owen, 1965 | Silurian Wenlock | England | |
Bassler, 1928 | Ordovician Ashgill=Katian-Hirnantian | Canada Quebec Anticosti Is. | |
Yaroshinskaya, 1984 | Late Ordovician | Mongolia | |
Cumings & Galloway, 1913 | Ordovician Ashgill=Katian-Hirnantian | USA Indiana | |
Astrova, 1965 | Middle Ordovician | Russia Siberia | |
Modzalevskaya in Modzalevskaya & Nekhoroshev, 1955 | Late Ordovician Sandbian | Russia Siberia | |
Kopajevich, 1984 | Ordovician Ashgill=Katian-Hirnantian | Mongolia | |
(Ulrich, 1890) | Ordovician | USA Illinois | |
Modzalevskaya, 1977 | Ordovician Caradoc=Sandbian-Katian | Russia Tuva | |
Ulrich, 1893 | Ordovician Caradoc=Sandbian-Katian | USA Tennessee | |
Ernst & Key, 2007 | Ordovician Caradoc-Ashgill=Sandbian-Katian | France | |
Bassler, 1906 | Silurian Wenlock | USA New York | |
(Ulrich, 1883) | Ordovician Caradoc=Sandbian-Katian | USA Ohio | |
Modzalevskaya in Modzalevskaya & Nekhoroshev, 1955 | Middle-Late Ordovician | Russia | |
Fritz, 1957 | Ordovician Caradoc=Sandbian-Katian | Canada Ontario |
Nicholsonella at University of Georgia.
Nicholsonella from Nashville region: at University of Georgia.
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