Explanation:

Titanosaur is a group of long-necked plant-eating dinosaurs that walked on four legs. Scientists have recently discovered the fossils of a dinosaur species named ‘Ninjatitan zapatai’ which lived 140 million years ago during the Cretaceous Period.
The fossils which have been unearthed, is said to be the oldest-known member of the dinosaur group known as titanosaurs.