Was Megalosaurus the first dinosaur ever discovered?

Unearth the truth behind Megalosaurus! Was it REALLY the earliest dinosaurs discovered Dive into the fascinating history of paleontology and uncover who holds the prehistoric crown.

In the annals of paleontological history, the name Megalosaurus holds a significant place, often heralded as the pioneering discovery in the realm of dinosaurs. However, amidst the intrigue and fascination surrounding this colossal creature lies a lesser-known truth: Megalosaurus was not the first dinosaur to be unearthed by curious eyes. Instead, it emerged as the inaugural species to be meticulously examined, scientifically described, and formally named, marking a pivotal moment in the study of prehistoric life. Delving beyond the surface, we unravel the compelling narrative that elucidates how Megalosaurus, though not the initial find, became the cornerstone of dinosaur taxonomy and our understanding of Earth’s ancient inhabitants.

Early Discovery of Dinosaurs

The early discovery of dinosaurs is a fascinating journey that began long before the creatures were properly understood or even given a name. Initial discoveries were often misinterpreted due to the lack of scientific knowledge and frameworks for classification.

first dinosaur fossil

Misinterpretations and Lack of Classification

Early Fossil Finds: The first recorded discoveries of dinosaur fossils date back to ancient times. For instance, in ancient China, large bones found by farmers were often thought to be dragon bones, not dinosaur bones. Similarly, in Europe, large fossilized bones were sometimes believed to be the remains of giants or other mythological creatures.

17th and 18th Century: During the 1600s and 1700s, as European naturalists began to systematically study fossils, many large bones and teeth were still not properly understood. In 1677, Robert Plot, an English naturalist, described and illustrated a large femur, which he thought belonged to a giant human. Later, it was recognized as the genus Megalosaurus bone.


Early 19th Century: By the early 1800s, the scientific community started to make strides in understanding these ancient creatures. William Buckland, in 1824, described Megalosaurus but did not fully grasp its significance as a dinosaur. Similarly, Gideon Mantell discovered Iguanodon in 1822 but initially mistook its teeth for those of a large iguana.

The Appearance of the Word "Dinosaur"

The term “dinosaur” was coined much later, in 1842, by Sir Richard Owen, a British paleontologist. Owen recognized that the various giant fossil reptiles being discovered represented a distinct group of ancient reptiles. He derived the name from the Greek words “deinos,” meaning “terrible” or “fearfully great,” and “sauros,” meaning “lizard” or “reptile.” Owen’s work was pivotal in establishing dinosaurs as a unique group of reptiles, distinct from other ancient creatures.

Key Contributions to the Classification of Dinosaurs

Richard Owen’s Contribution: Owen’s classification in 1842 laid the foundation for modern dinosaur paleontology. His identification of common features among various dinosaur fossils helped distinguish them from other prehistoric reptiles.

dinosaur fossil

Development of Paleontology: Following Owen’s work, the field of paleontology expanded rapidly. Discoveries in Europe and North America in the latter half of the 19th century, such as the well-documented fossil expeditions of Edward Drinker Cope and Othniel Charles Marsh, contributed to a more comprehensive understanding of dinosaurs.

Refinement of Classification Systems: As more fossils were discovered, scientists developed more detailed and accurate classification systems. This included distinguishing between different types of dinosaurs, such as theropods (predatory dinosaurs like Tyrannosaurus rex), sauropods (long-necked giants like Brachiosaurus), and ornithischians (herbivorous dinosaurs like Triceratops).

Discovery of Megalosaurus

Who Discovered Megalosaurus

Megalosaurus was the first dinosaur genus to be scientifically described. The discovery and description of Megalosaurus are credited to multiple individuals over time:

  1. Robert Plot (1676): The earliest recorded discovery of Megalosaurus fossils occurred in 1676 when Robert Plot, an English naturalist, described a large thigh dinosaur bone found in Oxfordshire. He initially attributed it to a giant human. He published a description and illustration in his Natural History of Oxfordshire in 1676. It was the first illustration of a dinosaur bone published.

  2. Reverend William Buckland (1824): The formal scientific description of Megalosaurus was made by William Buckland, a British geologist and paleontologist, in 1824. Buckland described it as a giant reptile and published his findings in a paper titled “Notice on the Megalosaurus or Great Fossil Giant Lizard of Stonesfield.”

Megalosaurus fossil

Relevant Circumstances of Discovery

Location: The significant fossil remains of Megalosaurus were discovered in the Stonesfield slate quarries in Oxfordshire, England. The Stonesfield location is part of the Jurassic strata, which is now known to be rich in dinosaur fossils.


Initial Fossils: The fossils found included a lower jaw with teeth, vertebrae, limb bones, and other fragments. These remains were identified as belonging to a large, carnivorous reptile.

Scientific Context: During the early 19th century, the concept of extinct giant reptiles was emerging, but the classification and understanding of these creatures were still developing. Buckland’s description came at a time when paleontology was becoming a more formalized scientific discipline.

Megalosaurus bucklandi display 1

Description of Megalosaurus and its Paleontological Significance

  1. Physical Characteristics: Megalosaurus was a large theropod dinosaur, estimated to be about 9 meters (30 feet) long. It had a massive skull with sharp, serrated teeth, indicating it was a carnivore. Its robust limbs and large claws suggest it was a powerful predator.

  2. Morphological Features: The fossils revealed characteristics typical of theropods, such as hollow bones and three-toed limbs. This classification placed Megalosaurus within the broader group of carnivorous dinosaurs.

Paleontological Significance

  1. First Scientific Description: Megalosaurus holds the distinction of being the first dinosaur to be scientifically described and named. This was a groundbreaking moment in paleontology, marking the beginning of the formal study of dinosaurs.

  2. Foundation for Dinosaur Studies: Buckland’s description of Megalosaurus laid the groundwork for future dinosaur discoveries and research. It demonstrated that giant reptiles once roamed the Earth, challenging existing beliefs about the history of life.

complete Megalosaurus fossil

Impact on Subsequent Dinosaur Discoveries and Research

  1. Catalyst for Paleontology: The discovery and description of Megalosaurus ignited interest in the study of prehistoric life. It prompted further fossil hunts and the eventual discovery of other dinosaur species.

  2. Classification Systems: The identification of Megalosaurus as a distinct genus helped paleontologists develop classification systems for dinosaurs. This contributed to a better understanding of the relationships between different prehistoric species.

  3. Inspiration for Scientists: Megalosaurus inspired subsequent paleontologists, such as Gideon Mantell, who discovered Iguanodon, and Richard Owen, who coined the term “dinosaur.” It played a crucial role in the establishment of paleontology as a scientific discipline.

  4. Educational and Cultural Impact: The concept of dinosaurs captured the public’s imagination, leading to increased interest in natural history museums and educational programs. Megalosaurus, as the first named dinosaur, became an iconic figure in the popularization of paleontology.

a man in black and the complete Megalosaurus fossil

Megalosaurus and Other Early Discoveries

Other Dinosaur Species Discovered Around the Same Time

  1. Iguanodon: Discovered by Gideon Mantell in 1822, Iguanodon was one of the first dinosaur species to be identified. Mantell found large fossilized teeth and bones in the Weald of England and initially believed them to belong to a giant iguana, hence the name Iguanodon.

  2. Hylaeosaurus: Also discovered by Gideon Mantell in 1832, Hylaeosaurus was found in the Tilgate Forest in Sussex, England. Mantell identified it based on fragmentary remains, including vertebrae and dermal spines, which he interpreted as belonging to an armored dinosaur.


These early discoveries were crucial in forming the foundation of dinosaur paleontology and helped establish the notion that the Earth was once inhabited by these giant reptiles.

Debate Over Which Dinosaur Was Truly First Discovered

The question of which dinosaur was truly first discovered is subject to interpretation and depends on the criteria used to define “discovery.”

  1. Fossil Evidence: If the discovery is based on the earliest recognition of dinosaur fossils, Robert Plot’s description of a large thigh bone in 1676, later identified as Megalosaurus, could be considered the first.

  2. Scientific Description: If the criterion is the first scientific description and naming of a dinosaur, then Megalosaurus, described by William Buckland in 1824, is often regarded as the first dinosaur to be formally recognized in scientific literature.

  3. Contemporaneous Discoveries: Iguanodon, discovered by Gideon Mantell in 1822 but described scientifically after Megalosaurus, also contends for the title of the first dinosaur discovered. Mantell’s work was crucial in developing the early understanding of dinosaurs.

dinosaur fossil

Criteria for Identifying the "First" Dinosaur

Determining the “first” dinosaur involves several factors:

  1. Discovery Date: The chronological order of fossil discovery plays a role, though it is complicated by reidentifications of earlier finds.

  2. Scientific Recognition: The formal scientific description and naming of a species are critical. This includes detailed documentation and publication in scientific literature.

  3. Public Awareness and Impact: The impact on the scientific community and the public can also be a factor. Discoveries that significantly influenced the field of paleontology and our understanding of dinosaurs hold substantial weight.

Streptospondylus: A Contender for the First Dinosaur Discovery


Who Discovered Streptospondylus

Streptospondylus was discovered by the French naturalist Georges Cuvier. The first fossils attributed to Streptospondylus were found in the early 19th century in the Normandy region of France. Cuvier initially described these remains in 1808, recognizing them as the bones of a large prehistoric reptile.

Why Streptospondylus May Be Considered an Earlier Discovery

Streptospondylus is a significant discovery in the history of paleontology, and there are several reasons why it might be considered an earlier dinosaur discovery than Megalosaurus or Iguanodon:

Early Recognition by Cuvier (1808): Georges Cuvier described the fossils in 1808, which predates the formal scientific description of Megalosaurus in 1824 and the identification of Iguanodon in 1822. Cuvier’s work was foundational in paleontology, and his recognition of the fossils as belonging to a large, extinct reptile was an important step in understanding prehistoric life.

Fragmentary Remains: The fossils Cuvier studied were fragmentary, including vertebrae and other bone fragments. Although he did not have a complete skeleton, he correctly identified them as belonging to a reptile, which was an important insight at the time.

Reassessment and Identification: Initially, the remains Cuvier described were not identified as a distinct dinosaur genus. It wasn’t until later that these fossils were reclassified and assigned to the genus Streptospondylus. This reclassification highlighted the early nature of Cuvier’s discovery and its relevance to the study of dinosaurs.

Streptospondylus bones

Criteria for Identifying the "First" Dinosaur

When considering Streptospondylus as a contender for the title of the first dinosaur discovered, it’s essential to revisit the criteria for such a designation:

  1. Discovery Date: Cuvier’s description in 1808 makes Streptospondylus one of the earliest described large prehistoric reptiles, even though it was not initially recognized as a dinosaur.

  2. Scientific Recognition: While Cuvier’s recognition of the fossils was significant, the formal identification of Streptospondylus as a dinosaur came later. This factor complicates its claim as the first scientifically recognized dinosaur.

  3. Impact on Paleontology: Cuvier’s work laid important groundwork for the field of paleontology. His identification of the fossils as belonging to an extinct reptile contributed to the developing understanding of prehistoric life and extinction.

a man in blue riding on a red Megalosaurus costume.

Megalosaurus Costume From Only Dinosaurs


While Megalosaurus is often cited as the first scientifically described extinct dinosaur, the story isn’t clear-cut. Early classification issues and contenders like Streptospondylus complicate the “first dinosaur” title. Criteria such as initial discovery, proper identification, or anatomical resemblance add complexity. Ultimately, early dinosaur discoveries are a mix of chance, misinterpretations, and groundbreaking finds, paving the way for our evolving understanding of these prehistoric giants.

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