New Species of the Genus Lambeoceras Foerste (Actinocerida) from the Upper Ordovician of Central Siberia

History of the study, taxonomy, and distribution of the actinoceratid genus Lambeoceras Foerste are discussed. Three new nominal species and one form in open nomenclature from the Upper Ordovician (Nirunda horizon, Katian Stage) of Central Siberia (Podkamennaya Tunguska River basin) are described.