I was rummaging again in my storage building, pulling out fossils that I couldn't identify (or didn't appreciate) over the years. One of the teeth I pulled out was a three-toed horse tooth, this exquisite Nannippus tooth. This is the tiny hipparion, Nannippus peninsulatus (formerly, N. phlegon) first molar (m1).
N. peninsulatus are not common Florida fossils . . . they are Blancan in age (extinct about 2.2 Ma.bp), and Blancan mammal fossils are of limited distribution in Florida. I read that this species is more common in Texas.
Anyway, I was so pleased with the tooth, that I photographed it. I will add it to my drawer.