"Heterococcoliths"
   "Placoliths"
     Order †Arkhangelskiales (Bown & Hampton, 1997)
       Family †Arkhangelskiellaceae Bukry (1969)
         Genus †Acaenolithus Black (1973)
         Genus †Arkhangelskiella Vekshina (1959)
         Genus †Aspidolithus D. Noel (1969)
         Genus †Broinsonia Bukry (1969)
         Genus †Thiersteinia Wise & Watkins, in Wise (1983)