Here’s a paper that recovers overlooked data.
So it parallels what is done here.
Horses have only one finger and one toe,
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).
From the abstract:
“We revisit digit reduction in the horse and propose that all five digits are partially present in the modern adult forelimb.”
Even when fused, bones are still there.
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