Calamelaps Günther, 1866 (original description)
Calamoichthys Smith, 1866 accepted as Erpetoichthys Smith, 1865 (original description)
Cloeopsis Eaton, 1866 accepted as Cloeon Leach, 1815 (original description)
Cloëopsis Eaton, 1866 accepted as Cloeopsis Eaton, 1866 accepted as Cloeon Leach, 1815 (original description)
Cuspidella Hincks, 1866 (original description)
Dinotosaurus Seeley, 1866 † (original description)
Eucervus Gray, 1866 accepted as Odocoileus Rafinesque, 1832 (original description)
Euotaria Gray, 1866 accepted as Arctocephalus Cuvier, 1826 (original description)
Euplatella Gray, 1866 accepted as Euplectella Owen, 1841 (original description)
Gypsophoca Gray, 1866 accepted as Arctocephalus Cuvier, 1826 (original description)
Herpetaethiops Günther, 1866 (original description)
Macrornis Seeley, 1866 (original description)
Megalornis Seeley, 1866 (original description)
Neophoca Gray, 1866 (original description)
Ophiodes Hincks, 1866 accepted as Hydrodendron Hincks, 1874 (original description)
Pelagornis Seeley, 1866 † accepted as Enaliornis Seeley, 1876 † (original description)
Ptenornis Seeley, 1866 (original description)
Rhagerrhis Günther, 1866 (original description)
Zalophina Gray, 1866 (original description)