Ordovician ostracodes of the central part of Kotel’nyi Island, New Siberian Islands

Ostracodes from the Middle-Upper Ordovician deposits (Malodiring-Ayan, Teryutekh, and Anisin formations) of Kotel’nyi Island are studied in detail for the first time. Brief descriptions of Ordovician localities on the Tuor-Yuryakh and Kazarka rivers with fossil ostracodes of this age are provided. Two new species of the genera Krausella and Longiscula are described and figured. In addition, the previously described species and ostracodes in open nomenclature are figured.