Class Mammalia Linnaeus, 1758 - mammals
   Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
     Family †Picopsidae Fox, 1980, incertae sedis
       Genus †Picopsis Fox, 1980 [monotypic]
         1 †Picopsis pattersoni Fox, 1980