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Convergent evolution: Tarantulas evolved blue hue eight times

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Copulation of Haplopelma lividum/Flamesbane

From BBC News :

Tarantulas have evolved almost exactly the same shade of vibrant blue at least eight separate times.
That is the conclusion of a study by US biologists, exploring how the colour is created in different tarantula species.

The hue is caused by tiny structures inside the animals’ hairs, but those shapes vary across the family tree.

This suggests, the researchers say, that the striking blue is not driven by sexual selection – unlike many other bright colours in the animal kingdom.

This argument is also supported by the fact that tarantulas have poor colour vision, and do not appear to show off their hairy blue body parts during courtship. More.

The researchers think that the blue colour must be a signal to some other party.

See also: What is the true significance of convergent evolution?

and

Evolution appears to converge on goals—but in Darwinian terms, is that possible?

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2 Replies to “Convergent evolution: Tarantulas evolved blue hue eight times

  1. 1
    Robert Byers says:

    Very unlikely eh. It did not have convergent evolution times six.
    To speculate, they do, why not say secual selection created the differences and it became more genetic differences or something like that.?
    In guessing about origins one can guess anything. just like evos.

  2. 2
    Paul Giem says:

    B b b but I thought tarantulas formed a nested hierarchy, with the hierarchy formed by using one criterion matching that from other criteria. This sounds like cupholders in different models of cars (buries head in hands and sobs). Zachriel, help!

    /sarc

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