Archaeodontosaurus

Archaeodontosaurus is known only from a few teeth and some other bones, so scientists are still learning about it.1

Its teeth were shaped like those of prosauropods, an older group of dinosaurs, but its skeleton shows it was a true sauropod.1

It lived about 168 to 165 million years ago, during the Bathonian stage of the Jurassic.2

The only known species is named Archaeodontosaurus descouensi, after the collector Didier Descouens.1

Its fossils were found in the Isalo III Formation of Madagascar, which was once a coastal environment.15

Some scientists think it might be a very early member of the group Gravisauria, which includes many giant sauropods.1