![Ahli Sebut Bahwa Nanotyrannus adalah Spesies Berbeda dari Tyranosaurus Kecil](https://cdns.klimg.com/mav-prod-resized/480x/ori/feedImage/2024/1/11/1704979544696-weddh.jpeg)
![Ahli Sebut Bahwa Nanotyrannus adalah Spesies Berbeda dari Tyranosaurus Kecil](https://cdns.klimg.com/mav-prod-resized/480x/ori/feedImage/2024/1/11/1704979544696-weddh.jpeg)
The first Nanotyrannus skull was discovered in Montana in 1942, but for decades, paleontologists have debated whether it is a separate species or just a much larger juvenile T. rex. In this new study, paleontologists from the University of Bath, Nick Longrich, and paleontologists from the University of Chicago, Evan Saitta, reanalyzed the fossils, examining growth rings, Nanotyrannus anatomy, and an previously unidentified juvenile T. rex fossil.
By measuring growth rings on Nanotyrannus bones, they showed that these rings become increasingly dense towards the outer part of the bone - indicating slower growth. This suggests that these animals were nearing their full size; not fast-growing juveniles.
The translation of the given text from 'Bahasa' to 'English' while preserving the HTML tags is as follows: Model of fossil growth shows that these animals reach a maximum size of about 900-1,500 kg and 5 m - approximately 15% of the size of the giant T. rex, which grows to 8,000 kg and 9 m or more.
Source: Sci.news
"When I saw these results, I was very surprised. I didn't expect the results to be so convincing," said Dr. Longrich.
"\u201cIf they were still young, T. rex should have grown like crazy, gaining hundreds of kilograms of weight per year, but we didn't see that.\u201d"
add Dr. Longrich.
"If you see another young tyrannosaurus, they show many characteristics of adult tyrannosaurs. Tarbosaurus, which is still very young, a close relative of T. rex, shows the characteristics of adult tyrannosaurs," said Dr. Longrich."
"Like kittens look like cats and puppies look like dogs, different baby tyrannosaurs also look different. And Nanotyrannus doesn't look like T. rex at all." "It may have grown in a very different way from other tyrannosaurs, or other dinosaurs – but most likely it is not a T. rex."
"It has always been one of the big questions. Turns out we really found it," said Dr. Longrich.
"But the fossil was collected years ago, left in an unidentified bone box in the museum drawer, and then forgotten."
"The arms are actually longer than those of T. rex. Even the largest T. rex had shorter arms and smaller claws compared to this small Nanotyrannus. This is an animal where its arms are actually quite strong. It truly is just a completely different animal - small, fast, agile," said Dr. Longrich.
A paper about this discovery was published in the Fossil Studies journal.
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