Echinodermata

Echinosphaerites Wahlenberg, 1821

Selection of related publications
Rõõmusoks, A. 1970. Stratigraphy of the Viruan Series (Middle Ordovician) in Northern Estonia, I.
Regnéll, G. 1945. Non-Crinoid Peimatozoa from the Paleozoic of Sweden. A taxonomic study. Meddelanden från Lunds Geologisk-Mineralogiska Institution 108, 1-255.
Hecker, R. F. 1923. Echinosphaeritidae of the Silurian of Russia. Trav. Mus. Géol. Min. Pierre le Grand Acad. Sci. Russie IV, 1, 1-63.
Bekker, H. 1921. The Kuckers Stage of the Ordovician Rocks in NE Estonia. Acta Univ. Tartu A II, 1, 1-90.
Jaekel, O. 1899. Stammesgesihichte der Pelmatozoen. Erster Band. Thecoidea und Cystoidea.
Eichwald, K. E. 1860. Lethaea Rossica ou Paléontologie de la Russie, décrite et figurée. 1, Seconde Section de l’ancienne Période.