Liodon
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Liodon is a dubious genus of mosasaur from the Late Cretaceous, known from fragmentary fossils discovered in St James' Pit, England and possibly also the Ouled Abdoun Basin of Morocco. Though dubious and of uncertain phylogenetic affinities, Liodon was historically a highly important taxon in mosasaur systematics, being one of the genera on which the family Mosasauridae was based.
Moroccan mosasaur fossil erroneously assigned to Liodon anceps
Tylosaurus
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Tylosaurus is a genus of mosasaur, a large, predatory marine reptile closely related to modern monitor lizards and snakes, from the Late Cretaceous.
Profile view of a Tylosaurus proriger skull (FHSM VP-3)
Mounted T. proriger skull (a cast of KUVP 5033) showing both marginal and pterygoid teeth
T. bernardi skull with its jugal bone
(A) quadrates, (B) skull roofs, and (C) teeth of (i) T. nepaeolicus, (ii) T. proriger, (iii) T. bernardi, (iv) T. pembinensis, and (v) T. saskatchewanensis