New research suggests that tetrapods may have evolved slower due to having fewer skull bones.
that evolved from fish to have four limbs and digits. These animals include frogs, cats and even humans. After analyzing over 100 skull bones in extinct and non-extinct tetrapods, researchers found that tetrapods have fewer skull bones than fish — both extinct and living. Asuggests that the limited number of skull bones could have prevented evolution for millions of years.
"Tetrapod skulls generally have fewer skull bones than their fish ancestors, but simply counting the number of bones misses some important data," says lead study author James Rawson in a press release. "We used a technique called network analysis, where the arrangement of skull bones — which bones connect to which — is recorded in addition to bone number."helps provide graph and numerical data.
"It might seem strange, but having fewer bones means each of those bones must connect with more of its neighbors, resulting in a more complex arrangement," says Rawson in a press release. "Modern frogs and salamanders had the most complex skulls of all the animals we studied."
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