One of the largest turtles that ever lived prowled the lakes and rivers of north...
WASHINGTON - One of the largest turtles that ever lived prowled the lakes and rivers of northern South America from about 13 million years ago to 7 million years ago - and this car-sized freshwater beast was built for battle.
Stupendemys males, unlike the females, boasted sturdy front-facing horns on both sides of the carapace - or shell - very close to the neck. Deep scars detected in the fossils indicated that these horns may have been used like a lance for fighting with other Stupendemys males over mates or territory. The first Stupendemys fossils were found in the 1970s but many mysteries remained about the animal. The new fossils included the largest-known turtle shell - 9.4 feet long, even larger than Archelon’s shell - and the first lower jaw remains, which gave clues about its diet.
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