Bryozoa

Sonninopora Vinassa de Regny, 1921

Selection of related publications
Rõõmusoks, A. 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I.
Männil, R. M. 1959. On Ordovician stratigraphy and bryozoans of Estonia.
Bassler, R. S. 1911. The Early Paleozoic Bryozoa of the Baltic Provinces. Bulletin of the US National Museum 77, 1-382.