Nicholsonella Ulrich, 1890

Type species: Nicholsonella ponderosa Ulrich, 1890

This genus includes the species:

Nicholsonella acanthobscura	McKinney, 1971	Ordovician Caradoc=Sandbian-Katian	USA Alabama	WoRMS 1405757
Nicholsonella adumbrata	Modzalevskaya, 1977	Ordovician Ashgill=Katian-Hirnantian	Russia Tuva	WoRMS 1405758
Nicholsonella amplexa	Kopajevich, 1984	Ordovician Ashgill=Katian-Hirnantian	Mongolia	WoRMS 1405759
Nicholsonella antiqua	Yabe & Hayasaka, 1920	Ordovician	China	WoRMS 1405760
Nicholsonella divulgata	Ernst & Key, 2007	Ordovician Caradoc-Ashgill=Sandbian-Katian	France	WoRMS 1405761
Nicholsonella faveolata	Pushkin, 1987	Late Ordovician	Belarus also Latvia	WoRMS 1438689
Nicholsonella genuina	Astrova, 1965	Early Ordovician Tremadocian-Floian	Russia Novaya Zemlaya	WoRMS 1405762
Nicholsonella houi	Yang, 1957	Ordovician Arenig=Floian-Dapingian	China	WoRMS 1405763
Nicholsonella inflecta	McKinney, 1971	Ordovician Caradoc=Sandbian-Katian	USA Alabama	WoRMS 1405764
Nicholsonella irregularis	Loeblich, 1942	Ordovician Caradoc=Sandbian-Katian	USA Oklahoma	WoRMS 1405765
Nicholsonella laminata	Ulrich, 1893	Ordovician Caradoc=Sandbian-Katian	USA Minnesota	WoRMS 1405766
Nicholsonella mariae	Astrova, 1965	Ordovician Caradoc=Sandbian-Katian	Russia Siberia	WoRMS 1405767
Nicholsonella mariae orientalis	Rozman et al., 1970	Late Ordovician	Russia	WoRMS 1414945
Nicholsonella moniliformis	Loeblich, 1942	Ordovician Caradoc=Sandbian-Katian	USA Oklahoma	WoRMS 1405768
Nicholsonella nelidovi	Nekhorosheva, 1965	Early Ordovician	Russia Novaya Zemlaya	WoRMS 1405769
Nicholsonella ottawaensis	Wilson, 1921	Ordovician Caradoc=Sandbian-Katian	Canada Ontario	WoRMS 1405770
Nicholsonella parafrondifera	McKinney, 1971	Ordovician Caradoc=Sandbian-Katian	USA Alabama	WoRMS 1405771
Nicholsonella parva	Owen, 1965	Silurian Wenlock	England	WoRMS 1405772
Nicholsonella parvula	Bassler, 1928	Ordovician Ashgill=Katian-Hirnantian	Canada Quebec Anticosti Is.	WoRMS 1405773
Nicholsonella peculiara	Yaroshinskaya, 1984	Late Ordovician	Mongolia	WoRMS 1405774
Nicholsonella peculiaris	Cumings & Galloway, 1913	Ordovician Ashgill=Katian-Hirnantian	USA Indiana	WoRMS 1405775
Nicholsonella petaloides	Astrova, 1965	Middle Ordovician	Russia Siberia	WoRMS 1405776
Nicholsonella polaris	Modzalevskaya in Modzalevskaya & Nekhoroshev, 1955	Late Ordovician Sandbian	Russia Siberia	WoRMS 1405777
Nicholsonella polymorpha	Kopajevich, 1984	Ordovician Ashgill=Katian-Hirnantian	Mongolia	WoRMS 1405778
Nicholsonella ponderosa	(Ulrich, 1890)	Ordovician	USA Illinois	WoRMS 1412357
Nicholsonella pseudopulchra	Modzalevskaya, 1977	Ordovician Caradoc=Sandbian-Katian	Russia Tuva	WoRMS 1405779
Nicholsonella pulchra	Ulrich, 1893	Ordovician Caradoc=Sandbian-Katian	USA Tennessee	WoRMS 1405780
Nicholsonella recta	Ernst & Key, 2007	Ordovician Caradoc-Ashgill=Sandbian-Katian	France	WoRMS 1405781
Nicholsonella ringuebergi	Bassler, 1906	Silurian Wenlock	USA New York	WoRMS 1405782
Nicholsonella spinigera	Ernst & Carrera, 2022	Late Ordovician Sandbian	Argentina	WoRMS 1590010
Nicholsonella vaupeli	(Ulrich, 1883)	Ordovician Caradoc=Sandbian-Katian	USA Ohio	WoRMS 1412358
Nicholsonella vaupeliformis	Modzalevskaya in Modzalevskaya & Nekhoroshev, 1955	Middle-Late Ordovician	Russia	WoRMS 1405783
Nicholsonella wilsonae	Fritz, 1957	Ordovician Caradoc=Sandbian-Katian	Canada Ontario	WoRMS 1405784

Nicholsonella at University of Georgia.
Nicholsonella from Nashville region: at University of Georgia.

Nicholsonella from fossiilid.info.