"Heterococcoliths"
   "Placoliths"
     Order †Podorhabdales Rood et al. (1971)
       Family †Biscutaceae Black (1971)
         Genus †Biscutum M. Black, in M. Black & Barnes (1959)
         Genus †Boletuvelum F.H. Wind & S.W. Wise, in S.W. Wise & F.H. Wind (1977)
         Genus †Crucibiscutum Jakubowski (1986)
         Genus †Discorhabdus Noel (1965)
         Genus †Gaarderella Black (1973)
         Genus †Gephyrobiscutum Wise (1988)
         Genus †Seribiscutum M.V. Filewicz, F.H. Wind & S.W. Wise, in S.W. Wise & F.H. Wind (1977)
         Genus †Similiscutum de Kaenel & Bergen (1993)
         Genus †Sollasites M. Black (1967)