Originally, it was thought that upper and lower molars were pretty much mirror images of each other, and minor details lead to the establishment of two genera: Thomasia and Haramiya.
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A description in January 2005 extended the published range to the Junggar Basin of Inner Mongolia.
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Butler & Hooker, (2005) maintain that 'haramiyids' are still stronger candidates for having given rise to the multituberculates than morganucodontids are: "As long as we only have teeth to of the critical taxa, we feel it necessary to adopt the Allotheria concept as a working hypothesis; no doubt the discovery of mammalian skeletal material in the Jurassic will throw new light on the problem", (p. 206).