When it was discovered in Argentina in 1987, Argentinosaurus, the world's biggest dinosaur, shook the world of paleontology to its foundations. Ever since its discovery, paleontologists have argued about the length and weight of Argentinosaurus. Some reconstructions put this dinosaur at 75 to 85 feet from head to tail and up to 75 tons, while others are less restrained, positing (somewhat less credibly) a total length of 100 feet and a weight of a whopping 100 tons. If the latter estimates hold, that would make Argentinosarus the biggest dinosaur on record based on well-attested fossil evidence. Given its gigantic size, it's appropriate that Argentinosaurus is classified as a titanosaur, the family of lightly-armored sauropods which spread to every continent on Earth later in the Cretaceous period. You are searching for something much smaller than the argentinosaurus. It's a tube being guarded by a scary guy lingering in the limbs.