Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Subphylum Diasoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
       Class †Rostroconchia Pojeta et al., 1972
         Order †Conocardioida Neumayr, 1891
           Genus †Arceodomus Pojeta & Runnegar, 1976
           Genus †Bigalea Pojeta & Runnegar, 1976
           Genus †Bransonia Pojeta & Runnegar, 1976
           Genus †Conocardium Bronn, 1834
           Genus †Eopteria Billings, 1865
           Genus †Euchasma Billings, 1865
           Genus †Hippocardia Brown, 1843
           Genus †Mulceodens Pojeta & Runnegar, 1976
           Genus †Pseudoconocardium Zavodovskii, 1960
           Genus †Pseudotechnophorus Kobayashi, 1933