A fossil of a prehistoric creature, Teleocrater Rhadinus, which is just a palm-sized pelvic bone, has overturned years of research.
According to the research, this slim, 2 meters long carnivorous reptile used to rule the Earth 245 million years ago, almost 10 to 15 million years before scientists thought dinosaurs have appeared. Also, there was a dimple on the fossil. A paleontologist at the Virginia Tech in Blacksburg, Sterling Nesbit found it when he tilted it towards the overhead light, illuminating a small depression in the fossil. After seeing the dimple, Nesbit said that it’s not a dinosaur because a true dinosaur has a complete hole in their hip socket rather than just a depression. Thus it waged a red flag.
Scientists think that the hole in the hip sockets helped the dinosaurs positioning their legs beneath their body rather than splay like the legs of crocodiles. Until recently, the hole was among a handful of revealing features paleontologists used to identify whether they had their hands on an actual dinosaur specimen. Another no-fail sign was an exceptional depression at the top of the skull. Until Teleocrater mucked things up they used to predate dinosaur, still, it had dinosaur skull depression. The long list of dino creatures is decreasing over a few decades because of some dinosaur relatives like Teleocrater. “I often get asked “what defines a dinosaur,” says Randall Irmis, a pathologist at the natural history museum of Utah. About 10 to 15 years ago, scientists listed dozens of feather about what makes a dinosaur but today, there’s is only one particular feather to specify dinosaurs. Randall says “the only one to still talk about is having a complete hole in a hip socket”
The profusion of the recent discovery of dinosauromorphs, the group of creatures that used to look like a dinosaur and lived alongside the early dinosaurs does more than call diagnostic features into question. To Nesbit, all these disruptions have placed an even more sacred cow on the chopping block, which is the uniqueness of the dinosaurs.
Here, in this picture, the number 1 shows a deep depression at the top of the skull and the attachment site for some jaw muscles. Only dinos were known to have them until Teleocrater came. Here at the number 2, dinos and some dinosauromorphs like Silesaurus opolensis had an expanded crest on their upper arm bone, where muscles attached. At the number 3, along with dinos, dinosauromorphs such as Silesaurus opolensis and Asilisaurus Kongwe may have had epipophyses, bony projections at the back of their neck vertebrae. The fourth one is an extra muscle attachment site known as Trochanter, at the point on the femur that meets the hip is also found in a dinosauromorph Marasuchus Iilloensis.
These dinosaurs signs scientists had to remove from their definitely a dinosaur list. Scientists told more about the dinosauromorphs that after the great dying about 252 million years ago, a massive number of species extinct. And almost 70 percent of land species and 90 percent of marine species died. The dinosauromorphs and the predecessor of crocs, crocodilians arose and flourished during Triassic, spanning 252 to 201 million years ago and their relatives, the dinos arrived around 230 million years ago. Dinosaurs have lived with their relatives, dinosauromorphs for millions of years but at the end of the period, another remarkable change of the climate took them to the doors of extinction but somehow, the dinos survived and ran to rule Earth in Jurassic. And about the dinosauromorphs, they extinct and probably, some of them made it to Jurassic and died in that period.
But still paleontologist doubt about it cause they tend to say that finding more fossils from early dinosaur and their close relatives is the surest way to fill in the gaps on how they evolved and get well organized up to the family tree.