Porifera

Cystostroma Galloway et St. Jean, 1957

Selection of related publications
Nestor, H. 1976. Early Paleozoic stromatoporoids from the Moiero River: North of the Siberian platform.
Nestor, H. E. 1964. Ordovician and Llandoverian Stromatoporoidea of Estonia. Trudy Instituta geologii AN ESSR , 1-112.