Xiongguanlong | The Tyrannosaur Bridge | Dino Basics

Added: 2026-05-31

[00:00:01]Welcome, my beautiful people, to another episode of Dino Basics, where we dig up the basics on some of our favorite deceased beasts. My name is Logan, and today we explore the basics on a significant paleontological find for the mightiest family of prehistoric sororans. While today Tyrannosaurus Rex reigns as one of the most well-known and ferocious dinosaurs, rarely do audiences take the time to ponder where exactly this mighty king would have come from.

[00:00:30]Well, as this dinosaur demonstrates, it seems these killers were not always so mighty. It's the ancient dragon of the Chinese wilds, Xiang Guanlong.

[00:00:43]The earliest discovered remains of Xang Guanlan Long would be attributed to a team of paleontologists, including American Mark Nurell in 2006 while working with a team of scientists from a local Chinese institution. These original remains would be recovered from the Xia Gao Formation, an area of the northwestern Chinese province of Gansoo.

[00:01:04]This specimen, which would include a fairly complete skull, most noticeably missing the lower jaw, a complete set of cervical and dorsal vertebrae, and a number of bones from the upper leg, including sections of the femur and ilium, would become the holotype specimen, and is still the only substantial fossil for this dinosaur today. description would take another 3 years until 2009 when a paper released by a team of American and Chinese paleontologists would provide a formal name for this creature calling it the Xian Guanl long beam andensis.

[00:01:39]Looking at the name Xian Guanlong, you may assume it has some relation to another early tyrannosaur, the Guanlong.

[00:01:47]You may be thinking perhaps like the strepto spondilus and you strepto spondilus these two could have some kind of correlation one being named after the other. That's actually really astute of you and really shows just how clever and attentive you can be. You should be really proud of yourself. I know I am.

[00:02:05]As for your observation, the answer is no. It's it's completely coincidental.

[00:02:10]Now stop interrupting. You're you're really starting to disappoint me. The name Xian Guan Long largely stems from Chinese and Mandarin with Xiang Guang being a historic name for the nearby region and still remains a subdist within the city of Gia Yuan.

[00:02:26]Long meanwhile translates from Mandarin to mean dragon having the name loosely translated to dragon of Xang Guang.

[00:02:36]The species name Beamo andensis comes from Beamo Castle, a site near where the dinosaurs fossils were originally recovered. The suffix Ensis is Latin and means from or originating in. So, the name literally means from Beamo.

[00:02:53]When it comes to classification, the Xian Guan Long was described as an exceptionally interesting member of the Tyrannosauridia super family. If the name didn't give it away, Tyrannosauroids are a broad group of carnivorous therapods that would include their family namesake, the Tyrannosaurus Rex. Importantly though, in relation to T-Rex, Xiang Wuan Long was not a member of the same subf family, the Tyrannosaur, or even the same family, the Tyrannosaurid.

[00:03:24]While Tyrannosaurids like T-Rex or the Albertasaurus largely hail from the late Cretaceous, the earliest Tyrannosauroids would first appear all the way back in the middle Jurassic represented in previous Dinobasics entry like the Proeratossaurus.

[00:03:40]If we're not obvious, these early tyrannosauroids are almost unrecognizable to something like a T-Rex, being significantly smaller, having a much less robust skull, and often having more well-developed forlims and hands.

[00:03:56]This is what paleontologists find most interesting about the Gian Guan Long. In its initial description and subsequent studies, many highlight Gian Guan Long as a significant transitional species for the Tyrannosauroids, bridging the smaller, humble members of the middle Jurassic to their tyrant descendants of the late Cretaceous.

[00:04:18]As for Xiang Guanlong itself, its stature certainly bore a closer resemblance to their earlier counterparts, only reaching about 5 feet or just under 2 m in height and growing to a length of about 12 feet or 4 m.

[00:04:32]Their smaller frames would net them a surprisingly light weight of between 440 to 600 lb or just about 200 to 270 kg.

[00:04:43]Now, before you make fun of this little guy, like every other funny haha under sixfoot meme, it's important to note that Gian Guan Long seemed to mark a significant trend in Tyrannosaurs as they grew into the mightiest creatures of their time. While they were still significantly smaller than their 9-tonon lake cretaceous relatives, the Xian Guan Long was nearly double the size of earlier Tyrannosaurs like the previously mentioned Guan Long, which appeared 160 million years ago and only measured about 6 feet or 2 m in length, showing significant growth that would only continue to accelerate moving into the Cretaceous.

[00:05:24]Speaking of transition, alongside this literal transition, while the skull of many tyrannosaurs would become their most devastating weapon, in the case of Xiang Guan Long, that transformation was still very much underway. While structurally similar to later tyrannosaurs, the skull of Giang Guanlong was far more elongated and lightly built, appearing almost caught halfway between the narrow snouted hunters of the Jurassic and the deep reinforced skulls of later Tyrannosaurids.

[00:05:55]Unlike giants such as Tyrannosaurus Rex, whose fused nasal bones helped withstand immense bone crushing bite forces, Xiang Wuan Long lacked many of these heavyduty reinforcements, suggesting its bite was likely far weaker than its later descendants. This reveals something crucial about Tyrannosaur evolution, as the overwhelming bite force later Tyrannosaurs became famous for seems to have developed relatively late within the group. Instead of relying purely on brute force, Xiang Guan Long likely hunted using a mix of speed, agility, and grip, using its long jaws to seize prey rather than simply crushing it outright.

[00:06:35]While much of their postcranial body is unknown, it likely bore many resemblances to other small to medium-sized tyrannosaurs.

[00:06:44]Due to their earlier timing relative to the T-Rex, the Xiang Guanl long likely had proportionally larger and more well-developed forlims. This trait is common among many early tyrannosauroids, as it seems these arms likely played an active role in hunting to grab potential prey. However, as Tyrannosaurs grew larger and their jaws grew stronger, their arms would play less of a role and thus would shrink over time. In stark contrast, the legs of Gian Guanl long were fittingly quite long and muscular, sometimes compared to ornithamosaurs like Galamimus. If this were the case, the Giang Guuan Long would be exceptionally agile and fast, likely further aided by their lightweight and thin, lengthy tails, providing them with exceptional speed to chase down potential meals.

[00:07:35]The Xian Guanlong would have lived during the early Cretaceous, sometime between 125 to 113 million years ago.

[00:07:44]Fossil evidence for the creature only exists in the northwestern regions of China, although it is entirely possible this could extend to other regions of China or possibly nearby countries like Mongolia or Russia. Location is actually a pretty decent point to bring up as Yong Wuan Long seemed to help fill in some blanks for the wider Tyrannosaur grouping. As I mentioned before, Tyrannosaurs would undergo a dramatic transformation from the Jurassic to the Lake Cretaceous, but they would also see a rapid shift in environment. Jurassic Tyrannosaurs would largely be restricted to areas of Europe and Asia, which makes sense as during this time the two continents were still connected as the remnants of the continent Laurasia, which once included North America until it steadily began separation 135 million years ago. However, by the late Cretaceous, while some Tyrannosaurs like the Tarbosaurus still remained in Asia, North America would see a sudden spike in Tyrannosaur populations in the form of Albertasaurus, Dasptosaurus, and of course, Tyrannosaurus Rex. But looking at any map, you'll probably think, how could this have possibly happened? While a few sparse early Cretaceous Jano were known in the early 2000s like the Asian Dylong or European Eotyrannis, paleontologists would largely be left in the dark, sometimes referred to as the Cretaceous Tyrannosaur Gap. However, the late 2000s and early 2010s would see the discovery of a number of new tyrannosaurs to help shed light on this mysterious transition in the form of our friend, the Xiang Guanlong, the feathered Utyrannis, and the Utah native Moros Intrepidus, among others.

[00:09:38]Paleontologists have proposed two main theories for how early Tyrannosaurs reach North America. One hypothesis suggests that Tyrannosaurs related to the Eot Tyrannis migrated from Europe to Appalachia, the eastern land mass of North America during the early Cretaceous, possibly by crossing temporary land connections or island chains formed after Europe and North America began separating.

[00:10:05]Another hypothesis proposes that Asian tyrannosaurs perhaps closely related to Xian Guanlong migrated from eastern Asia into Lara midia the western landmass of North America. This migration likely occurred across the bearing land bridge a recurring connection between Asia and North America that also later allowed humans to enter the Americas during the Ice Age. Some have even suggested a mix of the two. But whatever the case, further study of tyrannosaurs and the discovery of new tyrannosaurs will likely need to be done before a more conclusive answer can be provided. But as for Xang Guanlong itself, their ecosystem would be a coastal environment flush with vibrant lowlands and narrow hills. Despite its humble size, the Xiang Guanlong is believed to be one of the largest predators of its home, which is a bit unusual as ancient China during this time would be home to some truly exceptional creatures like the Bea Shan Long, an enormous ornithamosaur, which could grow to nearly 24 feet or 8 m at full size, potentially the largest known member of its group. or the equally impressive Sushawasaurus, a powerful therazinosaur believed to reach nearly 20 feet or 6 m in length.

[00:11:30]Sometimes called the dinosaur equivalent of a giant ground sloth. Such enormous prey has led many to believe other large predators would fill the role of apex predator during this time. While the Xiang Guang Mong would target younger prey or possibly smaller dinosaurs like the Archoeratops, an early member of the sereratopsian grouping only growing to around 3 ft or a meter in length. Despite this genus's significance for the Tyrannosaur grouping, few forms of media have chosen to feature this creature in really anything. Most would instead choose to star their larger, scarier descendants like the T-Rex. And when they would seek to explore earlier members, choose to feature flashier members like the especially early Pro Seratosaurus or even the feathered Utyrannus.

[00:12:22]Imagine doing that. That that would just be crazy. In any case, the Xiang Guanlong is largely only restricted to passing references such as in the 2016 documentary T-Rex, an evolutionary journey.

[00:12:38]While the Xian Guan Long may lack much representation, it is still no less a significant and fascinating creature, its insights into the past of one of the most remarkable family of dinosaurs ever known are truly invaluable. And while they may not have been the ones to brave the unknown American continents, their growing size and power would set the groundwork for their monumental rise on this new continent. It may be a gi long time before we can hope to see this Tyrannosaur make its popular debut, but I guess it's waited for at least 100 million years to be recognized. What's a few more?

[00:13:20]That's going to do it for this episode.

[00:13:22]Thank you so much for watching and I hope you enjoyed. Be sure to leave a comment below what you think of Xiang Guan Long and if you've heard this dinosaur before the video. Quite frankly, I really hadn't before this, but I really wanted to talk about Tyrannosaurs, so this seemed like a scientifically significant excuse to do that. So, why not? We are off next week, but the following week, we stray from the Dinobasics formula to tackle a larger concept in paleontology as we seek to understand one of the most significant ecological shifts in American history, the great American interchange. Thank you for your support and see you in the next video.