| Aigialosaurus Temporal range: Late Cretaceous |
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| Illustration of the A. dalmaticus holotype | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Sauropsida |
| Order: | Squamata |
| Suborder: | Scleroglossa |
| Superfamily: | Varanoidea |
| Family: | †Aigialosauridae |
| Genus: | Aigialosaurus Kramberger, 1892 |
| Species | |
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| Synonyms | |
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Opetiosaurus Kornhuber, 1901 |
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Aigialosaurus is an extinct genus of mosasauroid within the family Aigialosauridae. Its fossils have been found in Europe. It contains two species, Aigialosaurus dalmaticus and Aigialosaurus bucchichi.[1] Aigialosaurs were some of the oldest and most primitive ancestors of mosasaur and were closely related to monitor lizards.