Have you ever wonder what is the largest dinosaur ever was? Determining the size of the largest one is difficult, says paleontologist Alejandro Otero. After all, there was no giant scale that they could step on when alive. In most cases, paleontologists have to guess based on incomplete fossil records. Then, as they learn more about sauropods, they may discover that air sacks filled them, making them smaller than they first appeared.
Additionally, there is the problem of disappearing fossils. For example, 19th-century fossil hunter E. D. Cope claims to have found a fossil that is twice as large as any other fossil ever found, but it has mysteriously disappeared. Fossils from a Bruhathkayosaurus in India have disintegrated and are no longer available for study.
Nonetheless, we have attempted to create a list of the largest types based on their length. First, we considered the dinosaur’s length. Then, their weight in complying this list.
#10 World’s Largest Dinosaurs Ever: Xinjiangtitan shanshanesis – 98-feet Long
The Xinjiangtitan shanshanesis lived in northwest China during the middle Jurassic period. Arguably, scientists believe this one had the longest neck of any dinosaur ever to live, based on the fossils found in Xinjiang. Some evidence suggests that this type may only have been 88.6-feet long but stood over 56 feet in height. He weighed approximately 88,000 pounds.
#9 World’s Largest Dinosaurs Ever: Puertasaurus reuili – 98-feet Long
The only fossils found from a Puertasaurus reuili came from the Late Cretaceous Period. They were discovered in southwestern Patagonia, Argentina. Paleontologists believe this dinosaur was about 98 feet long and weighed approximately 110,000 pounds. Its recorded dorsal vertebra, which measures 5-feet-6-inches, is the broadest of any recovered vertebra fossil. The size and shape of this vertebra indicate that this one may have had a very wide rib cage. Therefore, it may have been heavier than other species from the same period.
Scientists believe that this dinosaur had a more flexible neck than most. Therefore, it was able to feed in a broader diet than those with a stiff neck. This may have been a great advantage because it could find food without moving very far.
#8 World’s Largest Dinosaurs Ever: Patagotitan mayorum – 98-feet Long
Experts believe that Patagotitan mayorum lived during the Late Cretaceous period, approximately 97 million years ago. Unlike many dinosaurs, where scientists have to do a lot of guesswork, 84 fossils have been recovered in Argentina’s Patagonia region. They are on display at the American Museum of Natural History. It measures over 121 feet long, but many experts believe there is a mistake in how the fossils have been assembled. They think this species was only about 98-feet long.
Paleontologists believe that if this dinosaur pointed its neck straight up, it would stand over 164 feet in height. Scientists think they have fossils from six different animals who returned to a lake bed at different times. They feel that the dinosaurs may have died because the lake went dry at various times, so the dinosaurs could not get enough to drink. This dinosaur weighed about 152,000 pounds.
#7 World’s Largest Dinosaurs Ever: Ruyangosaurus giganteus – 102-feet Long
Very little is known about the Ruyangosaurus giganteus. Chinese paleontologists found fossils in China in 2009. They believe the fossils are from the early Late Cretaceous period. Based on those limited fossils, which are the only ones from this dinosaur ever unearthed, scientists believe it was about 102-feet long. They also think that this dinosaur weighed about 100,000 pounds.
#6 World’s Largest Dinosaurs Ever: Sauroposeidon proteles – 105-feet Long
The Sauroposeidon proteles lived in Texas, Oklahoma, and Wyoming during the Early Cretaceous period. This dinosaur that may have been up to 105-feet long may have stood up to 55-feet tall. It may have weighed 112,000 pounds. The first fossils were found in Oklahoma in 1994, and they were put in storage by the University of Oklahoma because they believed they were petrified wood. It was not until six years later that a graduate student discovered the error and realized that they were some of the largest dinosaur bones ever recovered.
If this dinosaur could stick its head straight up in the air, then it probably reached about 59-feet in height, but it was only about 105-feet long. It may have weighed as much as 132,000 pounds. If you want to see Sauroposeidon proteles dinosaur tracks, head to Dinosaur Valley State Park, near Glen Rose, Texas.
#5 World’s Largest Dinosaurs Ever: Maraapunisaurus fragillimus – 105-feet Long
Only one fossil from the Maraapunisaurus fragillimus has ever been discovered. That fossil has been lost, so it is hard to describe this dinosaur accurately. The vertebra fossil was first studied found and studied in the 1870s when it was estimated that this dinosaur weighed 300,000 pounds and was over 164 meters long. A more recent study of the field notes suggests that this dinosaur belongs to the rebbachisaurid. That brings the size of this North American dinosaur down to 105-feet long and reduces its weight to 336,000 pounds. No one may ever know for sure unless a new fossil is found because moving this dinosaur whose only recovered fossil has been lost also requires you to believe that there was a typo in the paleontologist’s original report.
#4 World’s Largest Dinosaurs Ever: Argentinosaurus huinculensis – 108-feet Long
Although the Argentinosaurus huinculensis lived during the Late Cretaceous period, fossils of this dinosaur were not found until 1987 when a farmer out working his fields unearthed them near Plaza Huincul, Argentina. Scientists believe that this dinosaur could move up to 5 miles per hour and that it moved its front and back legs on each side of its body at the same time.
As with many dinosaurs, there is a lot of debate about this animal’s size. Some believe them to be as short as 106 feet while others insist this dinosaur was 130-feet long. Likewise, with its weight. Some believe it weighed as little as 132,000 pounds while others think he tipped the scale at more than 220,000 pounds. If more fossils are found, scientists may be able to form a stronger hypothesis.
#3 World’s Largest Dinosaurs Ever: Bruhathkayosaurus matleyi – 112-feet Long
The Bruhathkayosaurus matleyi is an Indian dinosaur that lived about 70 million years ago was initially thought to be about 115-feet long and weighing about 160,000 tons. Later, they downgraded their estimates to about 112-feet long but left the weight alone. Even as new scientific methods are developed, further testing cannot be done on this species unless new fossils are found. The ones that were studied have disintegrated.
India’s climate makes it unlikely that more fossils will ever be recovered. The monsoons saturate the fossils, making them break apart very easily. During the dry season, they grow bigger during the day, but they shrink at night. This often leads to the fossils breaking apart.
#2 World’s Largest Dinosaurs Ever: Supersaurus vivianae – 112-feet long
Fossils from the Supersaurus vivianae have been found in Colorado and may have been found in Portugal. This animal lived about 153 million years ago. In the past, experts believed that this species could be up to 141-feet long, but they have downgraded their opinion. It may have weighed as much as 80,000 pounds. This plant-eating dinosaur would have needed to eat about 1 ton of food each day.
Hikers out exploring Wyoming discovered the most complete Supersaurus vivianae fossils. About 60% of the animal is present. They reported their findings to the person who owned the land. This fossil was named Jimbo. Scientists believe that Jimbo was still very young, and he was 107-feet long. Scientists believe that a large fire occurred and was followed by a mudslide that swept Jimbo off his feet, killing him. Jimbo’s fossils are stored at the Wyoming Dinosaur Center, but they frequently travel the world on display.
#1 World’s Largest Dinosaurs Ever: Barosaurus lentus – 125-feet Long
Remains of the Barosaurus lentus have been found in Utah and South Dakota. These animals probably measured about 125-feet long, and it may have weighed up to 44,000 tons. This dinosaur that lived about 155 million years ago has an extra vertebra in its neck compared to many other dinosaurs, so scientists theorize that its neck was extremely long.
This dinosaur had forked bones in its tail with spikes. The tail ended with a whiplash. It is possible this dinosaur was able to use its tail as a weapon. This dinosaur may have reared up on its back legs to dine on plants far off the ground. When it did, it may have stood as high as 164-feet tall.
Scientists will continue to debate what the largest dinosaur in the world is and its characteristics.
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