Porifera

Cystostroma Galloway et St. Jean, 1957Galloway & 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.