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Chilesaurus dinosaur illustration.
Nationalgeographic.co.id – Chilesaurus diegosuarezi is one of the most enigmatic dinosaurs ever discovered. This ancient animal has an unusual combination of anatomical characteristics, as if combining the characteristics of meat-eating and plant-eating dinosaurs in one body. This uniqueness is what makes Chilesaurus an important key in understanding dinosaur evolution more broadly.
This dinosaur was first discovered in 2004 in Chile by a seven year old boy named Diego Suarez. Only in 2015, the fossil was officially given a name by a team of paleontologists from Argentina and Chile.
Species name diegosuares taken as a tribute to the young inventor. Chilesaurus lived in the Late Jurassic Period, around 150 million years ago, and to date several fossil skeletons have been found, providing a fairly complete picture of its body shape.
In terms of size, Chilesaurus is relatively small, with a length of around two to three meters. It walks on two legs (bipedal) and has a long tail which helps maintain body balance. From a distance, its posture is reminiscent of a carnivorous dinosaur-like Tyrannosaurus rex. However, this impression changed when the researchers examined the anatomy in more detail.
One of the most striking characteristics is the shape of its hips, which resemble those of bird-hipped dinosaurs (ornithischia)a group that includes Stegosaurus, Triceratops, and Iguanodon. In fact, so far dinosaurs with a body posture similar to Chilesaurus are usually included in the theropod group, the majority of which are meat eaters.
The weirdness doesn’t stop there. The structure of Chilesaurus’ ankles is actually similar to long-necked dinosaurs such as Plateosaurus. Meanwhile, its hind claws appear strong and capable of gripping, a characteristic commonly found in predators.
However, when the skull and teeth were analyzed, it became clear that Chilesaurus was a plant eater. The teeth are not sharp like a knife, but are designed for cutting leaves.
This combination of characteristics has made it difficult for scientists to classify Chilesaurus. Initially, this dinosaur was thought to be a relative of the meat-eating dinosaurs. However, further research involving scientists from the Natural History Museum, London showed different conclusions.
Recent research results suggest that Chilesaurus is actually a primitive member of the ornithischian group. This means that it was a plant-eating dinosaur, although it still retained many of the body characteristics of its carnivorous ancestors.
Researchers call Chilesaurus a rare example of a dinosaur that was “caught” in the middle of the evolutionary transition from meat-eating to plant-eating. This finding has major implications for the understanding of the dinosaur family tree.
In recent years, scientists have begun to question the traditional division of dinosaurs into three main groups. Previous research even suggested that ornithischian dinosaurs were more closely related to meat-eating theropods, compared to long-necked dinosaurs such as Diplodocus.
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