Hahnotheriidae

Butler, Percy M. & Hooker, Jerry J., 2005, New teeth of allotherian mammals from the English Bathonian, including the earliest multituberculates, Acta Palaeontologica Polonica 50 (2), pp. 185-207 : 199

Family Hahnotheriidae nov.

Type genus: Hahnotherium gen. nov.

Diagnosis.—Second upper molar longer lingually than buccally, only slightly narrowed distally. There are five buccal cusps, separated by transverse valleys, and seven lingual cusps on a ridge. Anterobuccal ridge absent. Central valley horizontal, rather than basined, open distally, its sides ornamented by regular series of ridges arising from the cusps. There are probably three roots, due to division of the mesial root.

Second lower molar short, with three lingual cusps, the first highest; buccal row shorter than lingual row, with several small cusps on a ridge.