Bivalvia

Cyrtodontoidea Ulrich, 1894

Selection of related publications
Isakar, M. & Sinitsyna, I. 1985. Redescription of E. Eichwald's Ordovician bivalve species. Proceedings of the Academy of Sciences of the Estonian SSR. Geology 34, 2, 46-54.
Sinicyna, I. N. 1983. New genus of Bivalve molluscs from the Middle Ordovician of north-east of East-European platform.
Bekker, H. 1921. The Kuckers Stage of the Ordovician Rocks in NE Estonia. Acta Univ. Tartu A II, 1, 1-90.