†G. acanthodon Le Hon, 1871
†G. aculeatus Davis, 1888
†G. acutus Storms, 1894
†G. aduncus Agassiz, 1843
†G. aegyptiacus Stromer, 1905
†G. alabamensis Leriche, 1942
†G. angustidens (Probst, 1878)
†G. appendiculatus Agassiz, 1843
†G. capellini Lawley, 1876
†G. casei Müller, 1999
†G. cheganicus Glikman, 1964
†G. clarkensis White, 1956
†G. contortus Gibbes, 1849
†G. crassidens Cope, 1872
G. cuvier (Péron & Lesueur, 1822)
†G. davisi (Chapman & Pritchard, 1904)
†G. denticulatus Agassiz, 1843
†G. dubius Noetling, 1885
†G. eaglesomei White, 1955
†G. egertoni (Agassiz, 1843)
†G. etruscus Lawley, 1881
†G. falcatus (Agassiz, 1843)
G. fasciatus van Kampen, 1907
†G. gajensis Tewari et al., 1960
†G. gibberulus Agassiz, 1843
†G. gibbus Costa, 1856
†G. hartvellii Cope, 1872
†G. jaekeli Woodward, 1895
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†G. laevissimus Cope, 1867
†G. latidens Agassiz, 1843
†G. lefevrei (Daimeries, 1891)
†G. maretsensis Winkler, 1876
†G. mayumbensis Darteville & Casier, 1943
†G. medius Wittich, 1898
†G. minor Agassiz, 1843
†G. mixtus Ameghino, 1901
G. obtusus Klunzinger, 1871
†G. pantanellii Lawley, 1876
†G. paulinoi Silva Santos & Travassos, 1960
†G. praecursor Darteville & Casier, 1959
†G. pristodontus (Agassi, 1843)
†G. productus Agassiz, 1856
G. rayneri Macdonald & Barron, 1868
†G. recticonus Winkler, 1874
†G. rosaliaensis Applegate, 1978
†G. semilevis White, 1926
†G. sismonda Gemmellaro, 1857
†G. subcrenatus Emmons, 1858
†G. sublaevis (Münster, 1842)
G. tigrinus Müller & Henle, 1839
†G. tremauxi Sauvage, 1880
†G. triqueter Eastman, 1904
†G. vincenti Daimeries, 1888
†G. wynnei Mehrotra et al., 1973
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