Hi all since Administrator Roger asked me in personal to make a topic that describes the Tylosaurus in it's details and where it's descendants are from what family members it has, well this is gonna be it, even my knowledge isn't that precise as that of a scientist , I will do my utmost best to explain these might prehistoric beasts of the Late Cretaceous Sea's that lived 145 to 65 million years ago.
Here a list showing all known Mosasaurinae, where also the Tylosaurs are a part of:
Subfamily Mosasaurinae Erimiasaurus aka Plesiotylosaurus crassidens
Amphekepubis
Dallasaurus turneri
Species of Carinodens Carinodens fraasi
Carinodens belgicus
Species of Clidastes Clidastes liodontus
Clidastes propython
Clidastes iguanavus
Clidastes moorevillensis
Species of Globidens Globidens alabamaensis
Globidens dakotensis
Globidens aegypticus
Globidens aegypticus
Globidens timorensis
Globidens schurmanni
Species of Moanasaurus Moanasaurus mangahouangae
Synonyms of Moanasaurus Mosasasaurus flemingi
Rikisaurus tehoensis
Species of Mosasaurus Mosasaurus hoffmannii
Mosasaurus missouriensis
Mosasasaurus conodon
Mosasasaurus lemonnieri
Mosasasaurus beaugei
Species of Prognathodon Prognathodon currii
Prognathodon giganteus
Prognathodon kianda
Prognathodon overtoni
Prognathodon rapax
Prognathodon saturator
Prognathodon solvayi
Prognathodon stadtmani
Prognathodon waiparaensis
Species of Plotosaurus Plotosaurus bennisoni
Plotosaurus tuckeri
Synonyms of Plotosaurus Kolposaurus
Garzasaurus
Subfamily Tylosaurinae:Species of Tylosaurus Tylosaurus capensis
Tylosaurus haumuriensis
Tylosaurus kansasensis
Tylosaurus nepaeolicus
Tylosaurus pembinensis
Tylosaurus proriger
Tylosaurus saskatchewanensis
Species of Hainosaurus Hainosaurus bernardi
Species of Taniwhasaurus Taniwhasaurus antarcticus
Taniwhasaurus mikasaensis
Taniwhasaurus oweni
Synonyms of Taniwhasaurus Lakumasaurus novas et al
Subfamily Plioplatecarpinae Angolasaurus bocagei
Ectenosaurus clidastoides
Igdamanosaurus aegyptiacus
Platecarpus coryphaeus
Plioplatecarpus primaevus
Yaguarasaurus columbianus
Species of Selmasaurus Selmasaurus johnsoni
Selmasaurus russelli
Subfamily Halisaurinae Eonatator sternbergii
Species of Halisaurus Halisaurus arambourgi
Halisaurus onchognathus
Halisaurus ortlebi
Halisaurus platyspondylus
Incertae sedis Goronyosaurus nigeriensis
Pluridens walkeri
Kourisodon puntledgensis
Russellosaurus coheni
Tethysaurus nopscai
Species of Liodon Liodon anceps
Liodon sectorius
Liodon compressidens
Liodon mosasauroides
Here a wonderful website showing a collection of all the knows Tylosaurus skulls found :)
[You must be registered and logged in to see this link.]The Tylosaurus proriger was the largest of all Tylosaurs, and possible also the largest of all Mosasaurinae's.
The Tylosaurus proriger was the T-Rex of the sea's it had no enemies as different species went it mainly lived alone, or probably in pairs, it's only fear was a larger variant of it's own kind.
So basically it was the worst thing you could come across if being something else that lived in the seas, quite ironic huh, similar to T-Rex, it was a fearless beast. What made me a fan of the Tylosaurus proriger is it's awesome looks it's size, it's brutal power it beams out and it reminds me of them early day sea monsters :)