Bryozoa

Ptilotrypa Ulrich, 1890

Selection of related publications
Gorjunova, R. V., Lavrentjeva, V. D. 1993. Morphology and morphogenesis of cryptostomes. Transactions of the Paleontological Institute (PIN) 257, 1-151.
Männil, R. M. 1959. Stratigraphy of Ordovician Bryozoa from Estonia. Kandidaadi dissertatsioon, 3 köidet (I, II, III), pp. 1-852.