Sigmoopsis (Sigmoopsis) Henningsmoen, 1953

Selection of related publications
Perrier, V., Meidla, T., Tinn, O., Ainsaar, L. 2012. Biotic response to explosive volcanism: Ostracod recovery after Ordovician ash-falls. Palaeogeography, Palaeoclimatology, Palaeoecology 365, 166-183. DOI:10.1016/j.palaeo.2012.09.024
Sidaravičiene, N. 1992. Ordovician ostracods of Lithuania.
Öpik, A. 1937. Ostracoda from the Ordovician Uhaku and Kukruse formations of Estonia. Tartu Ülikooli Geoloogia Instituudi Toimetused , 50, 1-58.
References based on distribution