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Deltatheroida Temporal range: Aptian–Maastrichtian PreЄ Є O S D C P T J K Pg N Early-Late Cretaceous Scientific classification Kingdom: Animalia Phylum: Chordata Class: Mammalia Subclass: Theria (unranked): Metatheria Order: †Deltatheroida Gregory and Simpson, 1926 Families & Genera Atokatheridium Khudulestes Oxlestes Deltatheridiidae Deltatheridium Deltatheroides Deltatherus Sulestes Deltatheroida is an extinct group of basal metatherians that lived in the Cretaceous and were closely related to marsupials. Their fossils are restricted to Central Asia and North America. This order can be defined as all metatherians closer to Deltatheridium than to Marsupialia. These mammals possessed tritubercular lower molars and these were not tribosphenic and were quite primitive. This is awkward because tribosphenic molars are found commonly in most therian mammals (there exist some exceptions such as anteaters and some whales which have no teeth at all). When they were first identified in the 1920s, they were believed to be placentals and possible ancestors of the creodonts (extinct carnivorous mammals), but this was later disproven. See also Alphadontia Asiadelphia Marsupial External links This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. Please improve this article by introducing more precise citations where appropriate. (November 2008) http://home.arcor.de/ktdykes/basmeta.htm Further reading Zofia Kielan-Jaworowska, Richard L. Cifelli, and Zhe-Xi Luo, Mammals from the Age of Dinosaurs: Origins, Evolution, and Structure (New York: Columbia University Press, 2004), 444-448.