The six-foot long Whatcheeria was discovered in a limestone quarry near the town of What Cheer, Iowa
l, that used its limbs for swimming. The creature was one of the first to have arms and legs instead of fins.of its time," by Ben Otoo, a co-author of the study, and a PhD student at the University of Chicago and the Field Museum.in a different way than was previously thoughtInstead of growing"slow and steady," as is the norm with reptiles and amphibians, scientists found it actually experienced rapid growth spurts in its youth.
Kenneth D. Angielczyk, MacArthur Curator of Paleomammalogy at the Field Museum and co-author on the study, told:"The thing that makes it unique among early tetrapods is the fact that it grew rapidly and continuously. In other early tetrapods that have been examined so far, they grow more slowly, and they usually have periodic pauses growth as well.
"In more general terms, Whatcheeria is pretty unique compared to a lot of its contemporaries because it was quite large, and it also had very heavily built limbs with large areas for muscle attachment. It seems to be an early experiment among tetrapods in being a large, powerful predator," Angielczyk added.
Despite having resembled a large salamander or crocodile, the four-legged superpredator was not related to the species. It was part of the lineage that eventually evolved into
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