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Riojasaurus is a type of dinosaur that lived about 228 to 213 million years ago during the Late Triassic period. Its name means “lizard from La Rioja,” named after the area in Argentina where its fossils were discovered. Riojasaurus was a plant-eater, belonging to a group of dinosaurs known as sauropodomorphs. This group includes the …

Syngonosaurus is an extinct type of dinosaur that lived a long time ago, in the Early Cretaceous period, around 105 to 100 million years ago. This dinosaur belonged to a group known as ornithopods, specifically called iguanodontians. It was first discovered in an area called Cambridge Greensand in England and was named by a scientist …

Tanystropheus is an extinct group of reptiles that lived during the Triassic Period, around 245 to 201 million years ago. Fossils have been discovered in places like Europe, Asia, and North America. One of the most striking features of Tanystropheus was its long neck, which was made up of 13 vertebrae. This neck was even …

**Staurikosaurus: A Look at an Early Dinosaur** Staurikosaurus is a type of dinosaur that lived during the Late Triassic period, around 225 million years ago. It is one of the earliest known dinosaurs and was discovered in Brazil, specifically in an area called the Santa Maria Formation. **What Did Staurikosaurus Look Like?** Staurikosaurus was relatively …

**Streptospondylus: A Dinosaur from the Past** Streptospondylus was a type of dinosaur that lived during the Late Jurassic period around 161 million years ago. This dinosaur is noted as a medium-sized predator that might have been about 6 meters long, which is roughly the same as a large van, and weighed around 500 kilograms, similar …

Coelophysis kayentakatae is an extinct dinosaur that lived around 200 to 196 million years ago during the Early Jurassic Period. It roamed what is now the southwestern United States. This dinosaur was first named Syntarsus kayentakatae but had to change names because “Syntarsus” was already used for a type of beetle. Later, it was called …

Tanystrosuchus is a name given to a type of dinosaur that lived a long time ago, around 208 million years ago, during the late Triassic period. Its name means “long crocodile,” and it is grouped into a category called theropods, which includes many meat-eating dinosaurs. So far, we have only found one important piece of …

Stegoceras is a fascinating type of dinosaur known for its unique dome-shaped skull. This dinosaur was part of a group called pachycephalosaurs, which lived in what is now North America during the Late Cretaceous period, around 77.5 to 74 million years ago. The name “Stegoceras” means “horn roof,” and its species name, “validum,” translates to …

**Struthiomimus: The Ostrich-Mimic Dinosaur** Struthiomimus was a type of dinosaur that lived during the Late Cretaceous period, about 77 to 66 million years ago. It was known as “ostrich-mimic” because it looked a lot like modern-day ostriches. **What Was It Like?** Struthiomimus belonged to a family of dinosaurs called Ornithomimidae. These dinosaurs were long-legged, walked …

Pinacosaurus is a type of dinosaur known as an ankylosaur. This dinosaur lived during the Late Cretaceous period, around 75 to 71 million years ago. Pinacosaurus was primarily found in regions we now call Mongolia and China. The first remains of this dinosaur were discovered in 1923, and the species named Pinacosaurus grangeri was described …