Nemegtbaatar
Nemegtbaatar is a genus of mammal from the Upper Cretaceous of Mongolia. It existed in the company of much larger dinosaurs. This creature was a member of the extinct order Multituberculata. It's within the suborder Cimolodonta and is a member of the superfamily Djadochtatherioidea. The genus Nemegtbaatar (Kielan-Jaworowska Z., 1974) is known by the species Nemegtbaatar gobiensis found in the Campanian (Upper Cretaceous) Nemegt Formation of Mongolia. "Compared to all extant mammals, the braincase in Nemegtbaatar and Chulsanbaatar is primitive." (Hurum, 1998). "All extant mammals" includes monotremes, such as the Duck-billed platypus, despite its residual egg-laying habit. Nemegtbaatar was a relatively large member of Djadochtatherioidea, with a skull length of up to 4.5 cm. At least one specimen is in the Institute of Paleobiology collection of the Polish Academy of Science at Warsaw, (ZPAL MgM-1/76).
References The abstract of Hurum (1998), [1] The braincase of two Late Cretaceous Asian multituberculates studied by serial sections. Acta Palaeontologica Polonica 43(1), p 21-52. Kielan-Jaworowska (1974), Multituberculate succession in the Late Cretaceous of the Gobi Desert (Mongolia). Palaeontologica Polonica, 30, p.23-44. Kielan-Jaworowska Z & Hurum JH (2001), "Phylogeny and Systematics of multituberculate mammals." Paleontology 44, p.389-429. Much of this information has been derived from [1] MESOZOIC MAMMALS; Djadochtatherioidea, an Internet directory.
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