Blue branches
Nonetheless, Bor-Kai Hsiung and his colleagues found that 40 out of 53 groupings (genera) of tarantula exhibit a very vibrant blue.
"We collected published data and constructed a super-tree, which combined the previous published small trees," said Mr Hsiung, a PhD student at the University of Akron in Ohio and the first author of the study, published in Science Advances.
They then mapped blueness onto that evolutionary tree, based on a bank of tarantula snaps scoured from the internet.
"If the genus has at least one species that's blue, we say that's a blue genus," Mr Hsiung explained.
Given that scattering of blue species, he added, they then calculated "the lowest number of changes that can produce a distribution of blue colouring like this".
The answer? "Eight is the lowest number, so it's [evolved] at least eight times.
Blue branchesNonetheless, Bor-Kai Hsiung and his colleagues found that 40 out of 53 groupings (genera) of tarantula exhibit a very vibrant blue."We collected published data and constructed a super-tree, which combined the previous published small trees," said Mr Hsiung, a PhD student at the University of Akron in Ohio and the first author of the study, published in Science Advances.They then mapped blueness onto that evolutionary tree, based on a bank of tarantula snaps scoured from the internet."If the genus has at least one species that's blue, we say that's a blue genus," Mr Hsiung explained.Given that scattering of blue species, he added, they then calculated "the lowest number of changes that can produce a distribution of blue colouring like this".The answer? "Eight is the lowest number, so it's [evolved] at least eight times.
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