title: The oldest placental mammal.
authors: Institute of Zoology, Russian Akademy of Sciences, St. Petersburg, Russia.
authors: A O
authors: AO
authors: Averianov
authors: P P
authors: PP
authors: Skutchas
mesh_terms: D000818:Animals; D005260:Female; D005580:Fossils; D008322:Mammals / Q000033:anatomy & histology / Q000145:classification*; D008986:Mongolia; D010161:Paleodontology; D010920:Placenta; D011247:Pregnancy; D014070:Tooth / Q000033:anatomy & histology*