The Eoraptor.
No, but there is one known as Predator-X but it's scientific name is Liopleuredon and it is a "super predator" so it is pretty well known. However, Liopleuredon was a pleasiosaur, not a dinosaur. Technically there were no sea dinosaurs.
The oldest known dinosaur is Eoraptor. It was found in Argentina and dates to about 231.4 million years ago.
The oldest dinosaur is the T-rex!
Eoraptor, who lived about 227,000,000 year ago.
The oldest known dinosaur fossil found in San Juan, Argentina, is an Eoraptor.
The oldest dinosaur was alive in the triassic period and is called the Melanorosaurus.
Dinosaur feet.
The oldest reptile was a dinosaur. But now a frog is the oldest reptile.
T-Rex
The oldest period is the Triassic period.
Thecondasaurus
There were a variety of omnivorous, predatory dinosaurs. One example is the Troodon, famous for being the "smartest" dinosaur known. Archaeornithomimus and Oviraptors are two other examples of predatory, omnivorous dinosaurs.