Class Mammalia Linnaeus, 1758 - mammals
   Subclass †Allotheria Marsh, 1880
     Order †Haramiyida Hahn, Sigogneau-Russell & Wouters, 1989
       Suborder †Haramiyoidea Hahn, 1973
         Family †Haramiyidae Simpson, 1947
           Genus †Thomasiaᵀ Poche, 1908
             1 †Thomasia antiquaᵀ Poche, 1908
             2 †Thomasia moorei (Owen, 1871)
             3 †Thomasia woutersi Butler & MacIntyre, 1994
             4 †Thomasia hahni Butler & MacIntyre, 1994