Ancient ‘weirdo’ reptile graduated from 4 legs to 2 in adolescence

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Title: Prehistoric Croc Cousin’s Incredible Growth Spurt: From Quadruped to Biped in a Single Lifetime

In a groundbreaking discovery that’s sending shockwaves through the paleontological community, researchers have unearthed evidence of an ancient crocodile relative that underwent a remarkable transformation as it matured. This Triassic-era creature, named Sonselasuchus cedrus, started life walking on all fours but transitioned to a bipedal stance in adulthood, much like a modern ostrich.

The team, led by Elliott Armour Smith and Christian Sidor from the University of Washington, made this fascinating find at Kaye Quarry in Arizona’s Petrified Forest National Park. Dating back approximately 215 million years, the site yielded over 3, 000 bones belonging to early crocodile relatives called shuvosaurids. Among these remains, the researchers identified a new species: Sonselasuchus cedrus.

What sets S. cedrus apart from its contemporaries is its unique growth pattern. As a juvenile, this creature’s forelimbs were about 75% the length of its hindlimbs, allowing it to walk on all fours. However, as it matured, its hindlimbs grew disproportionately larger, eventually comprising about 50% of its total body length. This growth pattern enabled the adult S. cedrus to stand and move on two legs, much like a modern-day ostrich or theropod dinosaur.

“It’s a fascinating example of evolutionary experimentation,” says Michelle Stocker of Virginia Tech, who was not involved in the study. “Shuvosaurids are these absolute weirdos that lived in the late Triassic, and they really look like dinosaurs.”

The discovery of S. cedrus adds to a growing body of evidence that crocodile-like animals in the early dinosaur era were incredibly diverse. Some species even adopted body plans and lifestyles similar to modern ostriches or other flightless birds. This diversity challenges the common misconception that crocodiles have remained largely unchanged since their prehistoric origins.

Interestingly, S. cedrus isn’t the only creature known to have made this quadruped-to-bipedal transition. A 2019 study found evidence of two dinosaur species undergoing similar transformations as they grew. One was a sauropodomorph, an ancestor of the massive sauropods like Brachiosaurus, while the other was an early ceratopsian distantly related to Triceratops.

The implications of this discovery are far-reaching. It suggests that juvenile and adult S. cedrus may have lived fairly separate lives and even consumed different diets, much like some modern crocodilians. This separation could have allowed for more efficient resource utilization within their ecosystem.

Moreover, the find highlights the incredible diversity of pseudosuchians – the branch of the reptile family tree that includes modern crocodiles. “They’re actually doing a lot of the really unique, crazy stuff first,” says Stocker, “and then dinosaurs are picking it up later.”

The discovery of Sonselasuchus cedrus serves as a reminder that the prehistoric world was far more complex and diverse than we often imagine. It challenges our preconceptions about the evolution of locomotion and body plans in ancient reptiles, opening up new avenues for research and understanding the intricate web of life that existed millions of years ago.

As paleontologists continue to unearth new fossils and piece together the puzzle of our planet’s distant past, discoveries like S. cedrus remind us that there’s still so much to learn about the incredible creatures that once roamed the Earth. Who knows what other surprises lie buried beneath our feet, waiting to rewrite the story of life on our planet?

Viral Tags and Phrases:

• “Triassic Transformer: Croc Cousin’s Amazing Growth Spurt”
• “From Four Legs to Two: Prehistoric Creature’s Incredible Journey”
• “Ancient ‘Ostrich Croc’ Challenges Our Understanding of Evolution”
• “Jurassic Park Who? Real-Life Dino Cousins Were Even Weirder!”
• “When Crocodiles Tried to Be Ostriches: The Untold Story”
• “Prehistoric Creature’s Growth Spurt Baffles Scientists”
• “Ancient Reptile’s Body Plan Ahead of Its Time”
• “Croc Cousins: The Original Bird Mimics”
• “215 Million Years Ago, This Croc Was Walking on Sunshine (and Two Legs)”
• “Fossil Find Rewrites the Book on Prehistoric Locomotion”
• “From Quadruped to Biped: Nature’s First ‘Transformers'”
• “Ancient Croc’s Growth Spurt: A Tale of Evolutionary Experimentation”
• “When Dinosaurs Were Just Copying Their Croc Cousins”
• “Prehistoric Creature’s Life: A Journey from Crawling to Strutting”
• “Fossil Find Proves: Crocs Were the Original Trendsetters of the Triassic”

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