New Data on the Genus Baltocrinus (Crinoidea, Iocrinidae) from the Ordovician of Leningrad Region

The calyxes articulated with stems are described, the characteristic pentagonal columns of which were known in the Baltic Ordovician since the time of Eichwald and were united by G.A. Stukalina in 1979 under the generic name Baltocrinus in her artificial taxonomy of crinoid columns. Studying the calyces allowed them to be classified in the family Iocrinidae of disparid crinoids and thus find a place for the genus Baltocrinus in the natural classification. Two species were distinguished by the calyces, one of which is new, and the other was successfully linked to the type species of the genus, distinguished by the columns.