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Horse fingers

Tuesday, February 6, 2018 11:42

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Here’s a paper that recovers overlooked data.
So it parallels what is done here.

Horses have only one finger and one toe,
right?

Now horses have portions of all five toes… extending to the hooves
(Solounias et al. 2017). And everybody overlooked that, until now (Figs. 1, 2).

Figure 1. Horse fingers extend to the hoof, separated from metacarpals by unossified tissue. Image from Solounias et al. 2017.

From the abstract:
“We revisit digit reduction in the horse and propose that all five digits are partially present in the modern adult forelimb.”

Figure 2. The modern horse, Equus, and extinct horse, Mesohippus manus. Colors over diagrams are from the original diagrams. Colors over proximal metacarpals added here. Image from Solounias et al. 2017.

Vestiges count.
Even when fused, bones are still there.

References
Solounias, et al. (6 co-authors) 2017. The evolution and anatomy of the horse manus with an emphasis on digit reduction. Royal Society Open Science 5:17182. http://dx.doi.org/10.1098/rsos.171782

Source: https://pterosaurheresies.wordpress.com/2018/02/07/horse-fingers/

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