Type species: Nicholsonella gibbosa Bassler, 1911
This genus includes the species:
(Modzalevskaya, 1953) | Ordovician Floian-Dapingian | Russia | WoRMS 1413521 | |
Liu, 1980 | Middle Ordovician | China | WoRMS 1407619 | |
(Modzalevskaya, 1953) | Ordovician Llanvirn-Darriwil=Darriwillian | Russia | WoRMS 1413522 | |
Goryunova, 1988 | Early Ordovician | Russia | WoRMS 1407620 | |
(Bassler, 1911) | Ordovician Darriwillian-Katian | Estonia, Russia | WoRMS 1413523 | |
Ernst & Munnecke, 2009 | Late Ordovician Hirnantian | Canada Quebec Anticosti Is. | WoRMS 1407621 | |
Liu, 1980 | Middle Ordovician | China | WoRMS 1407622 | |
Fedorov, Koromyslova, & Martha, 2017 | Early Ordovician Floian | Russia Saint Petersburg | WoRMS 1407623 | |
Koromyslova, 2008 | Early-Middle Ordovician | Russia | WoRMS 1407624 | |
(Modzalevskaya, 1953) | Ordovician Arenig-Caradoc | Estonia | WoRMS 1413524 | |
Ernst, Jiménez-Sánchez & Baidder, 2015 | Late Ordovician Hirnantian | Morocco | WoRMS 1407625 | |
Fedorov, Koromyslova, & Martha, 2017 | Early Ordovician Floian | Russia Saint Petersburg | WoRMS 1407626 |