| Named By: | Harry Govier Seeley in 1881 |
| Time Period: | Late Cretaceous, 95 Ma |
| Location: | Slovenia |
| Size: | Between 25 and 30 centimetres long |
| Diet: | Carnivore |
| Fossil(s): | Several specimens |
| Classification: | | Chordata | Reptilia | Anguimorpha | Pythonomorpha | Ophidiomorpha | |
Adriosaurus is an extinct genus of aquatic lizard that lived about 95 million years ago. It was snake-like and grew 10 to 12 inches. This is the first fossil record of vestigial limbs in lizards, and gives scientists a glimpse back to the time when terrestrial lizards evolved to be limbless and returned to their watery origins.
Cladogram based on Palci and Caldwell (2010a), Caldwell and Palci (2010b):