Fishes
   Class Cephalaspidomorphi Kiaer & Stensiö, 1920 see Class Osteostraci Lankester, 1868
     Order Petromyzontiformes Berg, 1940 - lampreys
       Family Petromyzontidae Bonaparte, 1831 - lampreys
         Subfamily Geotriinae see Family Geotriidae Gill, 1893
           1 Genus Dionisia Lahille, 1915
           2 Genus Exodomegas Gill, 1883
           3 Genus Exomegas Gill, 1883
           4 Genus Geotria Gray, 1851
           5 Genus Macrophthalmia Plate, 1897
           6 Genus Neomordacia Castelnau, 1872
           7 Genus Thysanochilus Philippi, 1857
           8 Genus Velasia Gray, 1851
           9 Genus Yarra Castelnau, 1872