| Nominal Species (n = 28) | Present allocation (n = 16) | Ref. |
|---|---|---|
| Halosaurus affinis Günther, 1877 | Aldrovandia affinis | 4448 |
| Halosaurus anguilliformis Alcock, 1889 | Aldrovandia affinis | 4448 |
| Halosaurus attenuatus Garman, 1899 | Halosaurus attenuatus | 4448 |
| Halosaurichthys carinicauda Alcock, 1889 | Halosaurus carinicauda | 40966 |
| Halosaurus goodei Gill, 1883 | Halosauropsis macrochir | 4448 |
| Aldrovandia gracilis Goode & Bean, 1896 | Aldrovandia gracilis | 4448 |
| Halosaurus guentheri Goode & Bean, 1896 | Halosaurus guentheri | 4448 |
| Halosaurus hoskynii Alcock, 1890 | Aldrovandia affinis | 4448 |
| Halosaurus johnsonianus (non Vaillant, 1888) | Halosaurus guentheri | 4448 |
| Halosaurus johnsonianus Vaillant, 1888 | Halosaurus johnsonianus | 4448 |
| Halosauropsis kauaiensis Gilbert, 1905 | Aldrovandia phalacra | 4448 |
| Halosaurus macrochir Günther, 1878 | Halosauropsis macrochir | 5164 |
| Halosaurus mediorostris Günther, 1887 | Aldrovandia mediorostris | 280 |
| Halosaurus niger Gilchrist, 1906 | Halosauropsis macrochir | 4448 |
| Halosaurichthys nigerrimus Alcock, 1898 | Aldrovandia phalacra | 4448 |
| Aldrovandia oleosa Sulak, 1977 | Aldrovandia oleosa | 4448 |
| Halosaurus ovenii Johnson, 1864 | Halosaurus ovenii | 4448 |
| Aldrovandia pallida Goode & Bean, 1896 | Aldrovandia affinis | 4448 |
| Halosaurus parvipennis Alcock, 1892 | Halosaurus carinicauda | 86686 |
| Halosaurus pectoralis McCulloch, 1926 | Halosaurus pectoralis | 9563 |
| Halosaurus phalacrus (non Vaillant, 1888) | Aldrovandia oleosa | 4448 |
| Halosaurus phalacrus Vaillant, 1888 | Aldrovandia phalacra | 4448 |
| Halosauropsis proboscidea Gilbert, 1905 | Aldrovandia affinis | 4448 |
| Halosaurus radiatus Garman, 1899 | Halosaurus radiatus | 9305 |
| Halosauropsis ridgwayi Fowler, 1934 | Halosaurus ridgwayi | 280 |
| Halosaurus rostratus Günther, 1878 | Aldrovandia rostrata | 4448 |
| Halosaurus sinensis Abe, 1974 | Halosaurus sinensis | 36648 |
| Halosauropsis verticalis Gilbert, 1905 | Aldrovandia phalacra | 4448 |