Phylum Mollusca Linnaeus, 1758 - molluscs Class Gastropoda Cuvier, 1795 - snails and slugs Subclass Heterobranchia Burmeister, 1837 [monotypic] see Superorder Heterobranchia Burmeister, 1837 Order Heterostropha Fischer, 1885 Superfamily Rissoelloidea Gray, 1850 Family Cornirostridae Ponder, 1990 Genus Noerrevangia Warén & Schander, 1993