The second longest dinosaur is Argentinosaurus, at 140 ft long.
its a dinosaur it is the dinosaur with the longest name ever
The longest dinosaur is believed to be Argentinasaurus, which could grow to 110 feet.
The dinosaur that lived the longest was the Brachiosaurus, which lived around 150 million years ago during the Jurassic period.
Diplodocus had the longest whip-like tail ever.
Liopleurodon
The tallest dinosaur ever discovered is a Sauroposeidon.However, this is not the longest or most massive dinosaur.
The longest dinosaur lenth is about 50 feet (15 meters) according to scientiests.
mamenchasaurus
It was not a dinosaur, but a plesiosaur and the longest plesiosaur. It could grow upto 15 m long.
The argentinosauraus is the biggest and longest.
58 year