Oldest Known Sea Turtle Fossil Discovered In South America

Oldest Known Sea Turtle Fossil Discovered In South America

SHARE THIS ARTICLE
  • 211
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
    211
    Shares

Oldest Known Sea Turtle Fossil Discovered In South America:

Reconstruction of Desmatocheyls padillai by Jorge Blanco.
Reconstruction of Desmatocheyls padillai by Jorge Blanco.

Paleontologists working in South America have described an ancient sea turtle as the key to understanding the turtle’s murky evolutionary history, and it is at least 25 million years older than any other known sea turtle fossil.

Edwin Cadena of the Senckenberg Naturmuseum in Germany and James Parham of California State University Fullerton unveiled a new species of a nearly two-meter-long marine turtle in the latest issue of PaleoBiosnamed Desmatochelys padillai from the Lower Cretaceous (120 million years old) of Colombia that sheds light on the mysterious origins of marine turtles and their confusing relationships to living sea turtles.

Until the local amateur paleontologist, Mary Luz Parra and her brothers Juan and Freddy Parra discovered Desmatochelys padillai near Boyacá, Colombia, Santanacheyls gaffneyi from Brazil was the previous oldest fossil sea turtle record holder.

Now, this new species can be used to date the radiation of sea turtles and perhaps help figure out their origins, as it has recently been proposed extinct marine turtles are not closely related to living species like loggerheads and leatherbacks.

Fossils of sea turtles are quite rare and also difficult to identify in the fossil record, as the primary marine adaptations of modern sea turtles like enlarged salt glands do not get preserved in the fossil record.

Luckily, enough diagnostic morphological evidence from the skulls and front paddles of specimens of D. padillai have been preserved to firmly identify it as a member of a group of marine turtles.

Desmatocheyls padillai in comparison to an average human
Desmatocheyls padillai in comparison to an average human

D. padillai was large, about as long as a 6-foot tall human, but this does not make it anywhere close to the largest sea turtle ever.

The largest sea turtle that ever lived was Archelon from the Cretaceous of South Dakota, growing to the monstrous size of more than four meters long and almost five meters wide.

The largest living sea turtle is the leatherback, which is roughly the same size as D. padillai would have been.

Even at 6 feet long, D. padillai was still a potential meal, as one specimen has a shell with two deep bite marks in it, probably caused by a pliosaur.


SHARE THIS ARTICLE
  • 211
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
    211
    Shares
Jessica Saraceni has been a part of Histecho Since 2018, drawn to the site for its quirky character and through Articles about the Mysteries of earth and human behavior. previously, she was an assistant editor and Research fellow at Archaeology magazine, where she gained an appreciation for the field work. A master's degree in biogeochemistry and environmental science from the Center for Archaeological Research, the University of Texas at San Antonio. She enjoys all forms of exercise; reading works by her favorite author, Haruki Murakami; and playing with her sons.

Leave a Reply

Your email address will not be published. Required fields are marked *