New belemnite species of the family Cylindroteuthididae are described from the Lower Cretaceous deposits of the Nordvik Peninsula, namely Arctoteuthis angusta sp. nov. and Boreioteuthis mirifica sp. nov. For the first time in East Siberia, the species Lagonibelus necopinus (Gustomesov, 1960), previously known only from the Northern Urals, was identified, and the ontogenetic changes of the rostra of this species were studied that made it possible to justify its subfamily and generic affiliation.
