"Rhinosaurus" redirects here. For the mammal, see 
Rhinoceros.
| Tylosaurus 
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|  | 
| Mounted cast of the T. proriger "Bunker" specimen (KUVP 5033) | 
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| Scientific classification | 
| Domain: | Eukaryota | 
 
| Kingdom: | Animalia | 
 
| Phylum: | Chordata | 
 
| Class: | Reptilia | 
 
| Order: | Squamata | 
 
| Clade: | †Mosasauria | 
 
| Family: | †Mosasauridae | 
 
| Clade: | †Russellosaurina | 
 
| Subfamily: | †Tylosaurinae | 
 
| Genus: | †Tylosaurus Marsh, 1872
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| Type species | 
| †Tylosaurus proriger 
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| Other species | 
| †T. nepaeolicus (Cope, 1874)†T. bernardi (Dollo, 1885)†T. gaudryi (Thevenin, 1896)†T. ivoensis (Persson, 1963)†T. iembeensis (Antunes, 1964)†T. pembinensis (Nicholls, 1988)†T. saskatchewanensis Jiménez-Huidobro et al., 2018
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| Synonyms | 
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Elliptonodon Emmons, 1858Rhamphosaurus Cope, 1872Rhinosaurus Marsh, 1872Hainosaurus(?) Dollo, 1885
 
Macrosaurus proriger Cope, 1869Macrosaurus pririger Cope, 1869Liodon proriger Cope, 1869Rhinosaurus proriger Marsh, 1872Rhinosaurus micromus Cope, 1872Tylosaurus dyspelor Leidy, 1873Tylosaurus micromus Merriam, 1894
 
Synonyms of T. nepaeolicus
Liodon nepaeolicus Cope, 1874Tylosaurus kansasensis? Everhart, 2005
 
Hainosaurus bernardi Dollo, 1885
 
Mosasaurus gaudryi Thevenin, 1896Hainosaurus gaudryi Lingham-Soliar, 1992
 
Leiodon lundgreni Schröder, 1885Mosasaurus hoffmanni ivoensis Persson, 1963Mosasaurus ivoensis Russell, 1967Hainosaurus ivoensis Lindgren, 1998
 
Synonyms of T. iembeensis
Mosasaurus iembeensis Antunes, 1964
 
Synonyms of T. pembinensis
Hainosaurus pembinensis Nicholls, 1988
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Tylosaurus (; "knob lizard") is a genus of russellosaurine mosasaur (an extinct group of predatory marine lizards) that lived about 92 to 66 million years ago during the Turonian to Maastrichtian stages of the Late Cretaceous. Its fossils have been found primarily around North Atlantic Ocean including in North America, Europe, and Africa.