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 †Helcionellidae Wenz, 1938
see Family Scenellidae Miller, 1889
Genus †Codonoconus Chen Yiyuan & Chang Shushen, 1980