Bryozoa

Helopora spiniformis (Ulrich, 1882)

Selection of related publications
Männil, R. M. 1959. Stratigraphy of Ordovician Bryozoa from Estonia. Kandidaadi dissertatsioon, 3 köidet (I, II, III), pp. 1-852.
Toots, H. 1952. Bryozoen des estnischen Kuckersits. Mitt. Geol. Staatinst. Hamburg 21, , 113-137.
References based on distribution