Species
Though many species of Tylosaurus have been named over the years, only a few are now recognized by scientists as taxonomically valid. They are as follows: Tylosaurus proriger (Cope, 1869), from the Santonian and lower to middle Campanian of North America (Kansas, Alabama, Nebraska, etc.); Tylosaurus nepaeolicus (Cope, 1874 ), from the Santonian of North America (Kansas); Tylosaurus kansasensis Everhart, 2005, from the late Coniacian of Kansas.
A closely related genus, Hainosaurus ("Haine lizard", named after the Haine River in Belgium) is known from the Cretaceous of North America and Europe. Both Tylosaurus and Hainosaurus are grouped together into the subfamily Tylosaurinae and are referred to informally as "tylosaurines" or "tylosaurs." Bell placed the tylosaurines together with the plioplatecarpine mosasaurs (Platecarpus, Plioplatecarpus, etc.) in an informal monophyletic grouping which he called the "Russellosaurinae."
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