Aigialosauridae
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| Agialosauridae Fossil range: Late Cretaceous |
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Skull of Opetiosaurus
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Aigialosauridae (Greek, aigialos = "seashore" + sauros= lizard) is family of Late Cretaceous semi-aquatic varanoid lizards, regarded by some paleontologists to form distinct monophyletic group and by others as an adaptive grade within the basal mosasauroids.

