Class Mammalia Linnaeus, 1758 - mammals
   Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
     Family †Holoclemensiidae Aplin & Archer, 1987, incertae sedis [monotypic]
       Genus †Holoclemensia Slaughter, 1968 [monotypic]
         †Holoclemensia texana (Slaughter, 1968)