Vertebrates
A new analysis indicates that Earth's vertebrate diversity is likely twice as high as previously estimated, with about two genetically distinct 'cryptic' species for every recognized one. Led by University of Arizona researchers, the study highlights how DNA sequencing reveals these hidden lineages that look nearly identical. This finding raises concerns for conservation efforts targeting undocumented species.
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Researchers at the University of St Andrews have discovered a key genetic change that likely allowed animals with backbones to develop greater complexity. By examining sea squirts, lampreys, and frogs, they found that certain genes began producing far more protein variations during the transition to vertebrates. This finding, published in BMC Biology, sheds light on the origins of diverse tissues and organs in species from fish to humans.