Dinosaurs That Start With R

Dinosaurs! These creatures have roamed the Earth before us humans and left us in awe with their existence, behavior, and extinction. Fossil records suggest that they lived during the Mesozoic Era, known also as the Age of Dinosaurs, for more than 150 million years. Scientists have identified and classified over 700 different species of dinosaurs, each with its unique features. From the herbivorous mighty long-necked Sauropods to the meat-eating Tyrannosaurus Rex, every type of dinosaur had its special niche in the ecosystem. Although these creatures have vanished from the face of the earth, their legacy still lives on and fascinates people of all ages today.

As an enthusiast of prehistoric creatures, compiling this list has been a dream project. It has allowed me to dive deep into the world of dinosaurs, and explore every aspect of their existence. With an understanding of their natural habitats, diets, and behavior, my list is an ode to these fascinating creatures.

So, let’s begin exploring this list of dinosaurs starting with R!

39 Dinosaurs That Start With R

And here’s the list of dinosaurs that begin with R letter.

Rachitrema

Rachitrema, also known as “Rachitrematidae,” is a genus of extinct iguanodontian dinosaur that lived in the early Cretaceous period, around 130 million years ago. Identified by its unique dental structure, this herbivorous dinosaur was most likely a bipedal animal with a long tail for balance. The scientific name “Rachitrema” comes from the Greek words “rachi” meaning “spine” and “trema” meaning “hole”.

Rahiolisaurus

Rahiolisaurus is a dinosaur genus that lived around 70 million years ago in the Late Cretaceous period in what is now Spain. It was a theropod dinosaur, meaning that it was a carnivorous bipedal dinosaur. Rahiolisaurus is known from a single, incomplete bone. Therefore, little is known about its physical characteristics or behavior. However, based on what has been found so far, it is believed that it was a fast and agile predator.

Rahonavis

Rahonavis was a small theropod dinosaur that lived in Madagascar during the Late Cretaceous period, around 70 million years ago. It was about 70 centimeters long and weighed about 1 kilogram. Rahonavis was a bipedal animal and most likely a carnivore. This dinosaur is known from just one skeleton, which was discovered in 1995. It is one of the most complete theropod dinosaur skeletons ever found in Madagascar.

Rajasaurus

Rajasaurus, which means “king of the princes”, is a genus of theropod dinosaur that lived in what is now India during the Late Cretaceous period, around 70-66 million years ago. This dinosaur was a large bipedal predator and was part of the abelisaur family, which was known for their short, deep skulls. Rajasaurus is known from one reasonably complete skeleton and a few isolated bones. The dinosaur had a large horn on top of its skull, which was possibly used for display or combat.

Rapator

Rapator is a genus of theropod dinosaur that lived in what is now Australia during the Late Cretaceous period, around 97-94 million years ago. The dinosaur was named after its perceived resemblance to the North American dinosaur velociraptor, although they are not closely related. Rapator was about 3 meters long and was most likely a fast runner and a skilled predator.

Rapetosaurus

Rapetosaurus was a genus of titanosaur sauropod dinosaur that lived in what is now Madagascar during the Late Cretaceous period, around 70-65 million years ago. It was a large herbivorous dinosaur that could grow up to 15 meters long and weigh up to 5 tons. Rapetosaurus is known from several partial skeletons, making it one of the best-known sauropods from Madagascar.

Raptorex

Raptorex was a small theropod dinosaur that lived around 125 million years ago during the Early Cretaceous period in what is now China. It is closely related to Tyrannosaurus rex and was named for its similar body structure and predatory nature. Although Raptorex was only about 3 meters long and weighed around 65 kilograms, it had a large, powerful head and sharp teeth, indicating that it was a skilled predator.

Ratchasimasaurus

Ratchasimasaurus, also known as “Phuwiangvenator,” was a genus of theropod dinosaur that lived in what is now Thailand during the Early Cretaceous period, around 125 million years ago. Ratchasimasaurus was a relatively small dinosaur, measuring about 4 meters long, but it had strong limbs and sharp claws. It was most likely a carnivore and hunted small to medium-sized animals.

Rativates

Rativates is a genus of extinct dinosaur that lived in what is now Argentina during the Late Jurassic period, around 155-150 million years ago. It is a sauropod dinosaur, which means it was a large, herbivorous dinosaur that walked on four legs. However, very little is known about this dinosaur, as it is only known from a few fossil teeth and vertebrae.

Rayososaurus

Rayososaurus was a genus of sauropod dinosaur that lived in what is now Argentina during the Late Cretaceous period, around 70-65 million years ago. This dinosaur was a titanosaur, which means it was a large herbivore that could grow up to 22 meters long and weigh up to 50 tons. There is very little known about Rayososaurus, as it is only known from a few bone fragments.

Razanandrongobe

Razanandrongobe is an extinct genus of crocodylomorph reptile that lived in what is now Madagascar during the Jurassic period, around 165 million years ago. Despite its crocodile-like appearance, Razanandrongobe was not a true crocodile. It was a large, terrestrial predator that could grow up to 7 meters long. With its powerful jaws and sharp teeth, it was probably the top predator in its ecosystem.

Rebbachisaurus

Rebbachisaurus was a genus of sauropod dinosaur that lived in what is now Africa during the Late Cretaceous period, around 100-95 million years ago. This dinosaur was a long-necked herbivore that could grow up to 20 meters long and weigh up to 30 tons. Rebbachisaurus had a unique skull structure that allowed it to process food more efficiently than other sauropods.

Regaliceratops

Regaliceratops, also known as “Hellboy” due to its bizarre horn structures, is a genus of ceratopsian dinosaur that lived in what is now Canada during the Late Cretaceous period, around 68 million years ago. This dinosaur was approximately 5.5 meters long and weighed around 1 ton. Regaliceratops is known from a single specimen that was discovered in 2005. It had unique horn structures that resembled those of the triceratops, but with a more elaborate and complex pattern.

Regnosaurus

Regnosaurus is a genus of iguanodontian dinosaur that lived in what is now South America during the Late Cretaceous period, around 85-70 million years ago. This dinosaur was a herbivore that could grow up to 8 meters long. It is known from scant fossils, so very little is known about its physical characteristics and behavior.

Revueltosaurus

Revueltosaurus is a genus of small, herbivorous dinosaur that lived in what is now New Mexico during the Late Triassic period, around 215-210 million years ago. This dinosaur was only about 60 centimeters long and is known from several well-preserved skeletons. Revueltosaurus had a unique dental structure that allowed it to feed on tough vegetation.

Rhabdodon

Rhabdodon is a genus of iguanodontian dinosaur that lived in what is now Europe during the Late Cretaceous period, around 70-65 million years ago. This dinosaur was a herbivore that could grow up to 6 meters long. Rhabdodon had a unique dental structure that allowed it to grind its food more efficiently than other iguanodontians.

Rhadinosaurus

Rhadinosaurus is a genus of sauropod dinosaur that lived in what is now South Africa during the Early Jurassic period, around 200 million years ago. This dinosaur was a herbivore that could grow up to 10 meters long. Rhadinosaurus had a massive, bulky body and short legs, which made it well-suited for supporting its enormous weight.

Rhinorex

Rhinorex is a genus of duck-billed dinosaur that lived in what is now Utah during the Late Cretaceous period, around 75 million years ago. This dinosaur was approximately 9 meters long and weighed around 4 tons. Rhinorex had a unique nasal structure that featured a large, hollow nasal crest that likely played a role in vocalization and display.

Rhodanosaurus

Rhodanosaurus is a genus of sauropod dinosaur that lived in what is now Switzerland and France during the Late Jurassic period, around 155-145 million years ago. This dinosaur was a herbivore that could grow up to 11 meters long. Rhodanosaurus was one of the earliest sauropods and had a long neck and tail, as well as a large, barrel-shaped body to support its weight.

Rhoetosaurus

Rhoetosaurus is a genus of sauropod dinosaur that lived in what is now Australia during the Late Jurassic period, around 165-150 million years ago. This dinosaur was a herbivore that could grow up to 18 meters long and weigh up to 40 tons. Rhoetosaurus had a long neck and tail, as well as a small head and brain, which suggests that it may not have been the most intelligent dinosaur.

Rhomaleopakhus

This obscure dinosaur is known only from a single jawbone, which has caused much speculation about its appearance and behavior. Some experts believe Rhomaleopakhus may have been a primitive member of the ornithopod family, while others suggest it may have been a small theropod. However, without additional fossil evidence, its true identity and characteristics remain a mystery.

Rhopalodon

Rhopalodon was a large, carnivorous dinosaur that lived during the Late Cretaceous period. Its name means “club-toothed,” which refers to the unique shape of its teeth. These teeth were flattened and serrated, and had a distinctive club-like shape at the base. This dinosaur likely used its powerful jaws to crush bone and slice through tough flesh, making it one of the apex predators of its time.

Riabininohadros

Riabininohadros was a genus of ornithopod dinosaur that lived during the Late Cretaceous period. Its name means “Riabinin’s hadrosaur,” in honor of the Russian paleontologist Evgeny Riabinin. This dinosaur was relatively small, with a slender build and long tail. It was an herbivore, and likely fed on vegetation using its beak-like mouth.

Richardoestesia

Richardoestesia was a small, carnivorous dinosaur that lived during the Late Jurassic period. Its name honors the American paleontologist Richard Estes. This dinosaur had sharp, serrated teeth that were well-suited for slicing through flesh. It likely predated upon small, fast-moving prey, using its agility and speed to catch its meals.

Rileyasuchus

Rileyasuchus was a crocodylomorph dinosaur that lived during the Late Cretaceous period. This animal was relatively small, with a streamlined body and long tail. It likely spent much of its time in water, using its powerful jaws and teeth to catch fish and other aquatic prey. Rileyasuchus is an important evolutionary link between reptiles and modern crocodilians.

Rinchenia

Rinchenia was a small, bird-like dinosaur that lived during the Late Cretaceous period. Its name means “Rinchen’s bird” in honor of the Mongolian paleontologist Rinchen Barsbold. This dinosaur had short, feathered arms and a beaked mouth, indicating that it was a fast, agile predator. It likely ate small animals like insects and lizards.

Rinconsaurus

Rinconsaurus was a medium-sized sauropod dinosaur that lived during the Late Cretaceous period. This dinosaur had a long neck, a round body, and a club-like tail. It likely fed on the vegetation that grew in the dense forests of its time. Based on the size of its teeth, Rinconsaurus may have also had the ability to swallow small stones to aid in digestion.

Rioarribasaurus

Rioarribasaurus was a theropod dinosaur that lived during the Late Jurassic period. This dinosaur had a long, slender body and a relatively small head. It likely hunted small animals like lizards and mammals, using its sharp teeth and claws to catch its prey. The discovery of Rioarribasaurus has helped shed light on the diverse range of small theropod dinosaur species that existed during the Late Jurassic.

Riojasaurus

Riojasaurus was a large, herbivorous dinosaur that lived during the Late Triassic period. This dinosaur had a stout body and a long neck, which it likely used to reach high branches for food. It likely spent much of its time in large herds, feeding on vegetation and fending off predators. Its fossilized remains have been found in South America, indicating that this dinosaur was once widespread across the region.

Riojasuchus

Riojasuchus was a carnivorous dinosaur that lived during the Late Triassic period. Its name means “Rioja crocodile,” in reference to the region of Argentina where its fossilized remains were discovered. This dinosaur had a long, narrow snout and sharp teeth, indicating that it was a fast and agile predator. It likely preyed upon small animals like lizards and early mammals.

Riparovenator

Riparovenator was a meat-eating dinosaur that lived during the Early Cretaceous period in what is now England. This large predator had sharp claws and teeth, and likely hunted large animals like ornithopods. Its name means “river hunter,” as it would have spent much of its time near bodies of water in search of prey.

Rocasaurus

Rocasaurus was a sauropod dinosaur that lived during the Late Cretaceous period. Its name means “rock lizard,” in reference to the rocky region of Argentina where its fossilized remains were discovered. This dinosaur had a long neck and tail, and likely fed on the vegetation that grew in the area. It was a relatively small sauropod, measuring around 30 feet in length.

Rubeosaurus

Rubeosaurus was a ceratopsian dinosaur that lived during the Late Cretaceous period. Its name means “red-horned lizard,” in reference to the distinctive shape and color of its horns. This dinosaur had a beak-like mouth that it likely used to feed on tough vegetation. Its large horns would have been used in territorial battles and to attract mates.

Ruehleia

Ruehleia was a small, bipedal dinosaur that lived during the Late Cretaceous period. Its name honors the German paleontologist Friedrich von Huene. This dinosaur had a slender build and long tail, and was likely an omnivore, feeding on both plants and small animals. Its fossilized remains have been found in Mongolia and China.

Rugocaudia

Rugocaudia was an ornithopod dinosaur that lived during the Early Cretaceous period. This dinosaur had a unique, hump-like structure on its back that may have been used for display or to store fat reserves. It also had a long tail that it likely used for balance and agility while running. Rugocaudia was an herbivore, feeding on the vegetation that grew in its environment.

Rugops

Rugops was a theropod dinosaur that lived during the Late Cretaceous period in what is now Africa. This dinosaur had a unique skull structure, with a flat top and several small horns. Its name means “wrinkle face,” in reference to the bumpy texture of its skull. It likely preyed upon small animals like lizards and mammals.

Ruixinia

Ruixinia was a small, bird-like dinosaur that lived during the Late Cretaceous period in what is now China. This dinosaur had a slender build and long, feathered arms, indicating that it was an agile, fast-moving predator. Its name means “Ruijin bird,” in honor of the Chinese paleontologist Zhenxin Zheng. It likely hunted small animals like insects and lizards.

Rukwatitan

Rukwatitan was a sauropod dinosaur that lived during the Late Jurassic period in what is now Tanzania. This dinosaur had a long neck and tail, and likely fed on the vegetation that grew in the region. Its fossilized remains have been found in a formation that also contains the fossilized remains of other dinosaurs, indicating that this region was once a diverse ecosystem.

Ruyangosaurus

Ruyangosaurus was a sauropod dinosaur that lived during the Late Jurassic period in what is now China. This dinosaur had a long neck and tail, and likely fed on the vegetation that grew in the area. Its name means “Ruyang lizard,” in reference to the region where its fossilized remains were discovered. Ruyangosaurus is an important link in the evolutionary chain of sauropod dinosaurs, as it provides important insights into the development of these massive animals.

Wrapping Up

And that’s our list of R dinosaurs.

I spent several days gathering information and cross-referencing names before I could even start compiling this list. It was a meticulous process. However, as I delved deeper into the subject, it was clear that I already had the expertise to create a list that encapsulates these formidable creatures’ essence.

All in all, the world of dinosaurs has been a captivating realm of exploration and discovery for scientists and enthusiasts alike. From the towering heights of the Brachiosaurus to the ferocious teeth of the Tyrannosaurus Rex, these prehistoric creatures have captivated our imaginations for generations. With each new fossil discovery and scientific breakthrough, we gain a better understanding of the complex ecosystems and evolutionary processes that allowed these creatures to thrive for millions of years. Even as we continue to unearth new insights into the world of dinosaurs, we must always appreciate the incredible diversity and resilience of the creatures that once roamed the Earth.

Hope this post on dinosaur names beginning with R alphabet has been useful to you!