Echinodermata
Genus

Sievertsia Smith et Paul, 1982

Selection of related publications
Reich, M. Kutscher, M. 2010. Cyclocystoids (Echinodermata: Echinozoa) from silurian of gotland, Sweden.Proceedings of the 12th International Echinoderm Conference, Durham, New Hampshire, USA, 7-11 August 2006 , pp. 67-70. Taylor & Francis.
Classification
References based on distribution