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  1. Turtle shell - Wikipedia

    • Recent stem-turtle fossil discoveries provide a "comprehensive scenario" of the evolution of the turtle's shell. A fossil that may be a stem-turtle from the Permian of South Africa, Eunotosaurus, some 260 million years ago, had a short broad trunk, and a body-case of broadened and somewhat overlapping ribs, suggesting an early stage in the ...… See more

    Overview

    The turtle shell is a shield for the ventral and dorsal parts of turtles (the order Testudines), completely enclosing all the vital … See more

    Shell nomenclature

    The turtle shell is made up of numerous bony elements, generally named after similar bones in other vertebrates, and a series of keratinous scutes which are also uniquely named. The ventral surface is called the p… See more

    Carapace

    The carapace is the dorsal (back), convex part of the shell structure of a turtle, consisting of the animal's ossified ribs fused with the dermal bone. The spine and expanded ribs are fused through ossification to … See more

    Plastron

    The plastron (plural: plastrons or plastra) is the nearly flat part of the shell structure of a turtle, what one would call the belly or ventral surface of the shell. It also includes within its structure the anterior and posterior br… See more

    Scutes

    The turtle's shell is covered in scutes that are made of keratin. The individual scutes as shown above have specific names and are generally consistent across the various species of turtles. Terrestrial tortoises do not shed th… See more

    Ontogeny

    The carapacial ridge plays an essential role in the development of the turtle shell. Embryological analyses show that the carapacial ridge initiates the formation of the turtle shell. It causes axial arrest which causes the … See more

    Evolutionary origin

    Zoologists have sought to explain the evolutionary origin of the turtles, and in particular of their unique carapace. In 1914, J. Versluys proposed that bony plates in the dermis, osteoderms, fused first to each other and t… See more

     
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  2. The fossil, thought to be 220 million years old, gives scientists new insights into how turtles got their shells. It provides evidence that turtle shells formed from their bellies as extensions of the backbone and ribs, not as bony plates evolved from skin.
    seaturtles.org/worlds-oldest-turtle-fossil-is-a-proto-sea-turtle/
    seaturtles.org/worlds-oldest-turtle-fossil-is-a-proto-sea-turtle/
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  3. New Fossil Shows How the Turtle Got Its Shell

    Feb 1, 2009 · A newfound fossil from southwestern China’s Guizhou Province paints a rather different picture of the origin of turtles and illuminates how their trademark armature took shape.

     
  4. How Do You Tell If A Turtle Shell Is A Fossil? – The …

    Oct 16, 2024 · 3 Ways To Identify A Turtle Shell Fossil. 1. Click Test; 2. Lick Test; 3. Burn Test; How Long Does It Take To Fossil A Turtle Shell? What Is The Oldest Turtle Shell Fossil? Where Can You Get A Turtle Shell Fossil? Before …

  5. Discovery: Turtle shells appeared 40 million years …

    May 30, 2013 · The oldest known fossil turtle dated back about 210 million years, but it had an already fully formed shell, giving no clues to early shell evolution. Then a clue came in 2008 when the 220 million-year-old fossil remains of an …

  6. Unlocking The Secrets Of Fossil Turtle Shell Identification: A ...

  7. How the turtle got its shell | The Department of Earth …

    Jun 10, 2013 · New research led by Tyler Lyson of Yale University and the Smithsonian Institution pushes back the origins of the turtle shell by about 40 million years, linking it to Eunotosaurus, a 260-million-year-old fossil reptile …

  8. Why the Turtle Grew a Shell—It’s More Than Safety

    Jul 22, 2016 · After years of studying fossils left behind by ancient turtles and their ancestors, a group of scientists have come to the conclusion that their shells weren’t initially for protection: they...

  9. ScienceShot: How the Turtle Got Its Shell | Science | AAAS

  10. The origin of the turtle shell: Mystery solved | ScienceDaily

  11. This 6-million-year-old turtle shell still has some DNA

    Sep 29, 2023 · The DNA comes from the remains of a turtle shell first uncovered in 2015 in the Chagres Formation on Panama’s Caribbean coast. It represents the oldest known fossil evidence of Lepidochelys...

  12. How The Turtle Got Its Shell : The Two-Way - NPR

  13. World's Oldest Turtle Fossil is a Proto-Sea Turtle | Turtle Island ...

  14. How Did Turtles Get Their Shells? Oldest Known Turtle Fossil, …

  15. This Ancient Creature Shows How the Turtle Got Its Shell

  16. Prehistoric turtle shell fossil was ‘stupendous’ giant

  17. Could DNA Have Survived 6 Million Years Inside a Turtle Shell?

  18. Turtles of Missouri | Missouri's Natural Heritage | Washington ...

  19. Missouri Fossils - Publication by DR Bruce L Stinchcomb - Lake …

  20. 56 Legit Places To Find Fossils In Missouri In 2024 - Rock Chasing