Phylum Mollusca Linnaeus, 1758 - molluscs
Conchifera Gegenbaur, 1878
see Subphylum Conchifera Gegenbauer, 1878
Cyrtosoma
Class Gastropoda Cuvier, 1795 - snails and slugs
Subclass †Archaeobranchia Parkhaev, 2001
Order †Helcionelliformes Golikov & Starobogatov, 1975
Superfamily †Helcionelloidea Wenz, 1938
see Superfamily Scenelloidea Miller, 1889
Family †Igarkiellidae Parkhaev, 2001, nom. illeg.
1 Genus †Gonamella Valkov & Karlova, 1984
2 Genus †Igarkiella Vassiljeva, 1998, nom. illeg.
3 Genus †Mastakhella Missarjevsky, 1989
4 Genus †Protoconus Yü, 1979