They are among the most derived representatives of the informal suborder "Plagiaulacida", and closely related to Cimolodonta.

Most eobaatarids are only known from isolated teeth, though several reasonably complete members are known, including Sinobaatar and Jeholbaatar.

The body of Sinobaatar is generalised,[3] while Jeholbaatar displays clear adaptations for scansoriality (climbing) due to its elongated digits.

[4] Due to the morphology of the cheek teeth, Eobaatar and Jeholbaatar are inferred to be omnivorous, likely feeding on plants and invertebrates.

[6][7] Fossils of Jeholbaatar kielanae seem to show that multituberculates independently acquired a middle ear from other mammal groups.