Mosasaurs comprise a group of extinct, large marine reptiles containing 40 genera in total. Their first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. Mosasaurs probably evolved from an extinct group of aquatic lizards[1] known as aigialosaurs in the Earliest Late Cretaceous. During the last 20 million years of the Cretaceous period (Turonian–Maastrichtian ages), with the extinction of the ichthyosaurs and pliosaurs, mosasaurs became the dominant marine predators. They became extinct as a result of the K-Pg event at the end of the Cretaceous period, about 66 million years ago.
¯\_༼ ಥ ‿ ಥ ༽_/¯乁༼☯‿☯✿༽ㄏ¯\(◉‿◉)/¯╮(＾▽＾)╭乁[ᓀ˵▾˵ᓂ]ㄏ┐( ˘_˘)┌乁[ᓀ˵▾˵ᓂ]ㄏ乁( ⁰͡ Ĺ̯ ⁰͡ ) ㄏ╮(╯_╰)╭┐(‘～`;)┌¯\_( ͠° ͟ʖ °͠ )_/¯┐(´ー｀)┌乁[ᓀ˵▾˵ᓂ]ㄏ┐( ˘_˘)┌╮(╯_╰)╭┐(´(エ)｀)┌乁( •_• )ㄏ┐(‘～`;)┌┐( ˘_˘)┌┐(´ー｀)┌乁༼☯‿☯✿༽ㄏ┐( ∵ )┌¯\_ʘ‿ʘ_/¯乁[ᓀ˵▾˵ᓂ]ㄏ乁( . ര ʖ̯ ര . )ㄏ乁 ˘ o ˘ ㄏ┐(￣ヘ￣)┌┐(‘～`;)┌乁[ ◕ ᴥ ◕ ]ㄏ╮(＾▽＾)╭¯\_༼ ಥ ‿ ಥ ༽_/¯┐(´(エ)｀)┌乁 ˘ o ˘ ㄏ┐(‘～`;)┌┐(￣ヘ￣)┌¯\(◉‿◉)/¯╮(. ❛ ᴗ ❛.)╭┐(´(エ)｀)┌乁( •_• )ㄏ乁| ･ 〰 ･ |ㄏ┐(´ー｀)┌┐(‘～`;)┌¯\(◉‿◉)/¯┐(´д`)┌乁 ˘ o ˘ ㄏ¯\_ʘ‿ʘ_/¯¯\_(⊙_ʖ⊙)_/¯乁( •_• )ㄏ┐(‘～`;)┌¯\_( ͠° ͟ʖ °͠ )_/¯(╯°□°）╯︵ ┻━┻(ﾉ´･ω･)ﾉ ﾐ ┻━┻(┛ಸ_ಸ)┛彡┻━┻┻━┻ ヘ╰( •̀ε•́ ╰)┻━┻︵└(՞▽՞ └)─=≡Σ(╯°□°)╯︵┻┻┻━┻ミ＼(≧ﾛ≦＼)┻━┻ ヘ╰( •̀ε•́ ╰)(ノT＿T)ノ ＾┻━┻┬─┬ノ(ಠ_ಠノ)┻━┻︵└(՞▽՞ └)(ノಥ,_｣ಥ)ノ彡┻━┻(ノ｀⌒´)ノ┫：・┻┻┻━┻ ヘ╰( •̀ε•́ ╰)(-_- )ﾉ⌒┫ ┻ ┣ ┳ʕノ•ᴥ•ʔノ ︵ ┻━┻(ノ•̀ o •́ )ノ ~ ┻━┻(┛❍ᴥ❍)┛彡┻━┻(ノಥ,_｣ಥ)ノ彡┻━┻(ノ｀⌒´)ノ┫：・┻┻(-_- )ﾉ⌒┫ ┻ ┣ ┳(ノ￣皿￣)ノ ⌒== ┫(ノT＿T)ノ ＾┻━┻(┛❍ᴥ❍)┛彡┻━┻(ノಥ,_｣ಥ)ノ彡┻━┻─=≡Σ(╯°□°)╯︵┻┻(ノಠ益ಠ)ノ彡┻━┻(ノ｀⌒´)ノ┫：・┻┻(ノ￣皿￣)ノ ⌒== ┫ʕノ•ᴥ•ʔノ ︵ ┻━┻┬─┬ノ( ͡° ͜ʖ ͡°ノ)ʕノ•ᴥ•ʔノ ︵ ┻━┻(┛❍ᴥ❍)┛彡┻━┻(ノ•̀ o •́ )ノ ~ ┻━┻(┛❍ᴥ❍)┛彡┻━┻(/¯◡ ‿ ◡)/¯ ~ ┻━┻┻━┻︵└(´_｀└)(ノ￣皿￣)ノ ⌒== ┫─=≡Σ(╯°□°)╯︵┻┻(ノ•̀ o •́ )ノ ~ ┻━┻(╯ರ ~ ರ)╯︵ ┻━┻┻┻︵¯\(ツ)/¯︵┻┻(ﾉ°_o)ﾉ⌒┫ ┻ ┣ ┳┻━┻︵└(՞▽՞ └)─=≡Σ(╯°□°)╯︵┻┻(ノಠ益ಠ)ノ彡┻━┻┬──┬◡ﾉ(° -°ﾉ)┬─┬ノ( ͡° ͜ʖ ͡°ノ)(ノT＿T)ノ ＾┻━┻┬─┬ノ(ಠ_ಠノ)(ノ•̀ o •́ )ノ ~ ┻━┻┬─┬ノ(ಠ_ಠノ)(ノಥ,_｣ಥ)ノ彡┻━┻(ノಠ益ಠ)ノ彡┻━┻(ﾉ´･ω･)ﾉ ﾐ ┻━┻ಠ ೧ ಠಠ_ಠಠ,_｣ಠʕಠ_ಠʔ(⌐■-■)¯\_ಠ_ಠ_/¯ರ╭╮ರತ_ತರ╭╮ರಠಿヮಠಠಿ_ಠಿಠಗಠಠಗಠಠ ͜ʖ ಠಠ∀ಠ(ب_ب)(눈‸눈)ರ╭╮ರಠ_ಠಠಗಠಠ,_｣ಠಠ_ʖಠಠ︵ಠಠ ೧ ಠಠಗಠಠಗಠಠ,_｣ಠಠωಠಠ ͜ʖ ಠಠ◡ಠಠ﹏ಠಠ﹏ಠಠ‿ಠಠ益ಠಠᴥಠʕಠ_ಠʔΣ(ಠ_ಠ)(ಠ_ಠ)>⌐■-■(⌐■-■)(⌐■-■)ಠ ل͟ ಠಠ ل͟ ಠರ╭╮ರ¯\_ಠ_ಠ_/¯ರ_ರರ╭╮ರರ╭╮ರತ_ತತ_ತತ_ತ
Mosasaurs comprise a group of extinct, large marine reptiles containing 40 genera in total. Their first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. Mosasaurs probably evolved from an extinct group of aquatic lizards[1] known as aigialosaurs in the Earliest Late Cretaceous. During the last 20 million years of the Cretaceous period (Turonian–Maastrichtian ages), with the extinction of the ichthyosaurs and pliosaurs, mosasaurs became the dominant marine predators. They became extinct as a result of the K-Pg event at the end of the Cretaceous period, about 66 million years ago.