Arthropoda
Biceratops Pack & Gayle, 1971
Callavia Matthew, 1897
Cambropallas Geyer, 1993
Eopeachella Webster, 2009
Esmeraldina Resser & Howell, 1938
Fremontella Harrington, 1956
Gabriellus Fritz, 1992
Holmia Matthew, 1890
Holmiella Fritz, 1972
Kjerulfia Kiaer, 1916
Mummaspis Fritz, 1992
Nevadella
Paedeumias Walcott, 1910
Peachella Walcott, 1910
Schmidtiellus Moberg, 1906
Wanneria Walcott, 1908
