Genus: Hahnotherium BUTLER & HOOKER, 2005
Etymology: In honor of Professor Gerhard Hahn, whose work laid the foundation for our knowledge of early multituberculates, and Greek, therium, 'wild beast'.

Species: antiquum BUTLER & HOOKER, 2005
Etymology: Latin, anitquum, "ancient": In reference to this is one of the earliest multituberculates.

Holotype: BMNH M46707

Locality: Clay bands of the “Kirtlington mammal bed’, Kirtlington Old Quarry (Old Cement Works Quarry), grid reference SP 494 199, Oxfordshire County, England, Southern United Kingdom.

Horizon: Forest Marble.

Biostratigraphy:

Age: Bathonian Stage, Middle Dogger Epoch, Middle Jurassic.

Material: A left second upper molar.

Referred material:

BMNN M46763: A right second lower molar.

BDUC J 782: Left upper premolar.

Note: Now missing.

Note both from bed 3w (i)