Echinodermata

Ristnacrinus Öpik, 1934

Selection of related publications
Ausich, W. I., Rozhnov, S. V., Kammer, T. W. 2015. Iocrinid Crinoids from the Ordovician of the Baltic Region, Estonia. Paleontological Journal 49, 2, 145-152. DOI:10.1134/S0031030115020069
Stukalina, G. A. 2000. Silurian of the Siberian Platform Crinoids. Transactions of the Paleontological Institute (PIN) 278, 1-108.
Stukalina, G. A. 1986. Zakonomernosti istoričeskogo razvitiâ krinoidej v rannem i srednem paleozoe SSSR.
Donovan, S. K. 1984. Ristnacrinus and the earliest myelodactylid from the Ashgillian Boda Limestone of Sweden. GFF 109, 4, 347-356. DOI:10.1080/11035898509454663
Yakovlev, N. N. 1956. A revision of the characteristics of the genus Ristnacrinus Öpik. Ežegodnik Vsesoûznogo Paleontologičeskogo Obŝestva XV, 155-157.
Öpik, A. 1934. Ristnacrinus, a new Ordovician crinoid from Estonia. Tartu Ülikooli Geoloogia Instituudi Toimetused 40, 1-7.