Phylum [Mollusca] Linnaeus, 1758 - molluscs Class Bivalvia Linnaeus, 1758 - bivalves Order Mytiloida Férussac, 1822 see Order Mytilida Férussac, 1822 Superfamily Pteriacea Gray, 1847 see Superfamily Pterioidea Gray, 1847 (1820) Family Isognomonidae Woodring, 1925 (1828) Genus Crenatula Lamarck, 1803