Bryozoa

Helopora spiniformis (Ulrich, 1882)

Selection of related publications
Männil, R. M. 1959. On Ordovician stratigraphy and bryozoans of Estonia.
Toots, H. 1952. Bryozoen des estnischen Kuckersits. Mitt. Geol. Staatinst. Hamburg 21, , 113-137.
References based on distribution