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In addition to showing that small hammerheads evolved from a large ancestor, the team showed that the "signature" cephalofoils of hammerheads underwent divergent evolution in different lineages over time, likely due to selective environmental pressures, said Martin.
These fundamental differences may be the result of long-term isolation and divergent evolution of the X chromosome in European and neotropical chernetids.
Porcine reproductive and respiratory syndrome virus comparison: divergent evolution on two continents.