New mammal remains from the Late Cretaceous Bostobe Formation (Northeast Aral Sea Region,Kazakhstan) |
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| Institution: | 1. Zoological Institute, Russian Academy of Sciences, Saint Petersburg 199034, Russia;2. Department of Sedimentary Geology, Geological Faculty, Saint Petersburg State University, Saint Petersburg 199178, Russia;3. Department of Biology, San Diego State University, San Diego 92182-4614, USA;4. Vertebrate Zoology Department, Saint Petersburg State University, Saint Petersburg 199034, Russia;5. Ocean and Earth Sciences, National Oceanography Centre, University of Southampton, Southampton SO14 3ZH, UK;6. MTA-DE “Lendület” Behavioural Ecology Research Group, Department of Evolutionary Zoology and Human Biology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary |
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| Abstract: | Four recently collected mammal specimens from the Upper Cretaceous (Santonian–?Campanian) Bostobe Formation in the northeastern Aral Sea Region, Kazakhstan are attributed to Asioryctitheria indet. (an edentulous dentary fragment) and the zhelestid Parazhelestes sp. cf. P. mynbulakensis (a maxillary fragment with a double-rooted canine, an M1, and a dentary fragment including m3). These new records double the known mammal fauna from this formation, which previously included the zhelestid Zhalmouzia bazhanovi and Zhelestidae indet. The taxonomic and ecological structure of the mammal assemblage from the Bostobe Formation can, on present evidence, be considered close to the other eutherian dominated Late Cretaceous mammal assemblages of Central Asia. This region is important in particular in the search for Late Cretaceous ancestors of crown-group eutherian mammal clades (Placentalia). |
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| Keywords: | Mammalia Stem Placentalia Late Cretaceous Bostobe Formation Kazakhstan |
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