Found in central florida in the bath tub. Its about the size of a pencil marking, very small. What is it?
This small hexapod appears to be a species of Springtail (or Collembola). It is similar to the one below, with slightly different markings.
From the University of Florida:
More information can also be found at NC State University Entomology Website: http://www.cals.ncsu.edu/course/ent425/library/compendium/collembola.html
It is hard to say what species it could be, but it looks most similar to:
or Isotomurus tricolour from Rick Cowen:
It is hard to tell but it seems to be part of this genera, or is at least in the family Isotomidae, if not the exact species.
Their taxonomy is actually under debate, and they are in a group of hexapods that are no longer considered insects.