Phylum Brachiopoda Duméril, 1806 - brachiopods
   Subphylum Rhynchonelliformea Williams et al., 1996
     Class †Strophomenata Williams et al, 1996
       Order †Productida Sarycheva & Sokolskaya, 1959
         Suborder †Lyttoniidina Williams et al., 2000
           Superfamily †Lyttonioidea Waagen, 1883
             1 Family †Lyttoniidae Waagen, 1883
             2 Family †Rigbyellidae Williams et al., 2000