[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Class Gastropoda Cuvier, 1795 - snails and slugs
       Family Firolidae Rang, 1829 see Family Pterotracheidae Rafinesque, 1814
         Genus Pterotrachea Forskål, 1775
           Pterotrachea coronata Forsskål, 1775 - sea elephant
           Pterotrachea hippocampus Philippi, 1836
           Pterotrachea minuta Bonnevie, 1920
           Pterotrachea scutata Gegenbaur, 1855