Arginbaatridae
Scientific classification
Kingdom: Animalia
Therapsida
Class: Mammalia
Order: Multituberculata
Family: Arginbaataridae
Genera
  Arginbaatar

Ref.

Arginbaatar was a Lower Cretaceous mammal from Mongolia. It was a member of Multituberculata, an order which is also extinct.

Genus: Arginbaatar Trofimov BA, 1980

Family: Arginbaataridae Hahn & Hahn, 1983

Species: Arginbaatar dimitrievae Trofimov BA, 1980
Place:
Country: Mongolia
Age: Aptian or ALbian, Lower Cretaceous
Remarks: This genus is the only known member of its family, which is thus monotypic. Some characteristics are "Plagiaulacida"-like, whilst others are more akin to the further derived suborder of Cimolodonta. Quite where it fits in is unclear. "This family shows a mixture of 'plagiaulacidan' and cimolodontan characters, (Kielan-Jaworowska & Hurum, 2001, p.415).
Reference: Trofimov (1980), Multituberculata and Symmetrodonta from the Lower Cretaceous deposits in Mongolia. Trans. (Dokl) USSR Acad Sci, Earth Sci Sect 251. p.188-191.

Page reference: Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p.389-429.

(This information has been derived from [1] MESOZOIC MAMMALS; Plagiaulacidae, Albionbaataridae, Eobaataridae & Arginbaataridae, an internet directory. As that's my webpage, there are no issues of copyright. Trevor Dykes)