"Heterococcoliths"
   "Placoliths"
     Order †Podorhabdales Rood et al. (1971)
       ?Family †Tubodiscaceae (Bown & Rufledge, 1997)
         Genus †Manivitella H.R. Thierstein (1971)
         Genus †Tubodiscus H.R. Thierstein (1973)