Chordata Bateson, 1885 - chordates
   Class Pisces Linnaeus, 1758 see Superclass Pisces Linnaeus, 1758
     Subclass Actinopteri Cope, 1871 see Class Actinopteri Cope, 1871
       Order Isospondyli Cope, 1887 see Order Osteoglossiformes Berg, 1940
         Suborder Clupeoidei Goodrich, 1909
           Family Phractolaemidae Boulenger, 1901 [monotypic] - snake mudheads
             1 Genus Phractolaemus Boulenger, 1901