"Heterococcoliths"
   "Muroliths"
     Order †Eiffellithales Rood, Hay & Barnard (1971)
       Family †Chiastozygaceae Rood, Hay & Barnard (1973)
         Genus †Zeugrhabdotus P. Reinhardt (1965)
           †Zeugrhabdotus sigmoides (Bramlette & Sullivan, 1961) Bown & Young (1997)