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Russian Journal of Theriology

Early Cretaceous mammals from Bolshoi Kemchug 3 locality in West Siberia, Russia // Russian J. Theriol. Vol.4. No.1: 112 [in English].

ABSTRACT. A small sample of mammalian isolated teeth and edentulous dentary fragments from the Early Cretaceous locality Bolshoi Kemchug 3 in Krasnoyarsk Territory, West Siberia, Russia, represents five taxa: amphilestid Kemchugia magna gen. & sp. nov., Amphilestidae indet., gobiconodontids Gobiconodon sp. A and B, and Mammalia indet. The large sized Kemchugia magna gen. & sp. nov. is based on two isolated molariforms. Amphilestidae indet. is represented by single molariform and two edentulous dentary fragments. Gobiconodon sp. A is similar in size to G. hoburensis from the Early Cretaceous of Mongolia. Gobiconodon sp. B is some 20% larger than G. borissiaki from the Early Cretaceous of Mongolia. A minute edentulous dentary with alveoli for two posterior molariforms is referred to Mammalia indet. Dental lamina pits on the lingual side of gobiconodontid jaws, interpreted as openings for the epidermal filaments connecting the dental lamina with the growing enamel cup of a developing tooth germ, are reported here for the first time and confirm replacement of molariform teeth in Gobiconodontidae. KEY WORDS: Amphilestidae, Kemchugia gen. nov., Gobiconodontidae, Gobiconodon, Siberia, Ilek Formation, Early Cretaceous.