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228 Million-Year-Old Turtle Fossil Misses the Shell

People & World

228 Million-Year-Old Turtle Fossil Misses the Shell

Donald Richardson beak, shell, turtle, turtle carapace, turtle evolution, turtle history August 23, 2018

A recently discovered turtle fossil believed to be 228 million years old misses one important thing: its shell

The shell is nowadays considered to be a crucial characteristic of turtles. However, history teaches us that turtles didn’t always have it all. The new species found in China’s Guizhou Province did possess a toothless beak, which is another key feature.

The discovered species has been given the name Eorhynchochelys sinensis, which translates to “dawn beak turtle from China,” as it is the first turtle to have a beak.

Moreover, it had a Frisbee-shaped body featuring wide ribs, but the ribs did not contribute to the formation of the shell as they do in modern turtles.

“This creature was over six feet long, it had a strange disc-like body and a long tail, and the anterior part of its jaws developed into this strange beak,” said Olivier Rieppel, study co-author and paleontologist at Chicago’s Field Museum, in a statement. “It probably lived in shallow water and dug in the mud for food.”

The evolution of turtles is quite complicated and hard to piece together due to the fact that their evolutionary track can’t actually be compared to others’.

Some other early turtles had a partial shell, but no beak. Odontochelys, which date to 220 million years ago, had a protective shell on its underside but not on the upper shell, which is called a carapace. On the other hand, Pappochelys – which lived 240 million years ago, had a bony structure over the belly.

Modern turtles have both a shell and a beak but also have an evolution that is more of a zigzag rather than a straight line.

“This impressively large fossil is a very exciting discovery, giving us another piece in the puzzle of turtle evolution,” said Nick Fraser, a study co-author with National Museums Scotland, in a statement. “It shows that early turtle evolution was not a straightforward, step-by-step accumulation of unique traits but was a much more complex series of events that we are only just beginning to unravel.”

Source: cnn.com

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