Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Pteriomorphia Beurlen, 1944 see Superorder Pteriomorphia Beurlen, 1944
       Order Mytilida Férussac, 1822 [monotypic]
         Suborder Mytilina Férussac, 1822 [monotypic] see Order Mytilida Férussac, 1822
           Superfamily Mytiloidea Rafinesque, 1815 [monotypic]
             Family Mytilidae Rafinesque, 1815 - marine mussels
               Subfamily Crenellinae Gray, 1840
                 Genus Crenella Brown, 1827
                   Subgenus Hippagus Lea, 1833