Kryptobaatar dashzevegi is a multituberculate mammal from late Cretaceous sediments of Mongolia. Multituberculates (including Tombaatar) are a group of extinct mammals known from the Jurassic to the Eocene in North America and Asia. They are believed to have been herbivorous or omnivorous, and derived features of their dentition are somewhat convergent upon those of rodents. Specifically, multituberculates are characterized by loss of the canines, having multi-cuspid molars, and one pair of lower incisors.
Although the exact placement of Multituberculata within Mammalia is under dispute, multituberculates are generally believed to fall outside Theria. Within multituberculates, Kryptobaatar is a member of Djadochtatheria, a clade comprised of 10 of the 11 multituberculate taxa known from the late Cretaceous of Mongolia. It is distinguishable from other djadochtatherians by a pterygoid canal either confluent with or barely separated from the carotid canal, and a separate hypoglossal foramen.
About the Species
This specimen was collected from the Djadokhta Formation of Ukhaa Tolgod, Mongolia by a joint Mongolian-American group of paleontologists. The specimen was made available for scanning by Dr. Guillermo Rougier of the University of Louisville and Dr. Michael Novacek of the American Museum of Natural History.
About this Specimen
The specimen was scanned by Richard Ketcham and Cambria Denison on 03 December 1997 along the coronal axis for a total of 364 slices, each slice 0.11 mm thick, with an interslice spacing of 0.08 mm (for a slice overlap of 0.03 mm).
Kielan-Jaworoska, Z., and J. H. Hurum. 1997. Djadochtatheria. A new suborder of multituberculate mammals. Acta Palaeontologica Polonica 42:201-242.
Rougier, G. W., M. J. Novacek, and D. Dashzeveg. 1997. A new multituberculate from the Late Cretaceous locality Ukhaa Tolgod, Mongolia: considerations on multituberculate interrelationships. American Museum Novitates 3191:1-26.
Rougier, G. W., J. R. Wible, and M. Novacek. 1996. Middle-ear ossicles of the multituberculate Kryptobaatar from the Mongolian Late Cretaceous: implications for mammaliamorph relationships and the evolution of the auditory apparatus. American Museum Novitates 3187:1-43.
Wible, J. R., and G. W. Rougier. 2000. Cranial anatomy of Kryptobaatar dashzevegi (Mammalia, Multituberculata), and its bearing on the evolution of mammalian characters. Bulletin of the American Museum of Natural History 247:1-120.