During the early 1990s, the new genus "Seismosaurus" was put forward as a candidate for the largest known dinosaur.

It had 19 vertebrae in its neck, more than any other known dinosaur had.

Not including birds (Avialae), the smallest known dinosaurs were about the size of pigeons.

This would make it the oldest known dinosaur from Portugal.

For a long time, Tyrannosaurus was the largest known carnivorous dinosaur.

Paleontologists announce the discovery of what is likely to be the oldest known dinosaur.

This makes Chromogisaurus one of the oldest known dinosaurs.

However, in no known dinosaur can the head, neck, and body be oriented in such a position.

At 60 cm (2 ft) in length it is one of the smallest known dinosaurs.

The titles of Riggs (1901) and (1903) suggested that the specimen was the largest known dinosaur.