Chigger, a nasty no see um bug that burrows in the skin leaving a very tiny hole that that due to their toxin itches like heck...
Trombiculidae - Wikipedia, the free encyclopedia
Best defense is to use Sevin dust in your socks and pants, tuck them tight into your high top boots...
Best cure is Hydrogen peroxide soak the area till it foams white, then cover with a salve such as Neo Sporin or bag balm...
try 60 - 100 legs, the little ones are wicked fast now imagine one 8 feet long...

and no danger of them being around today their repertory system could not handle our O2 levels...
I had to ask this of a Paleontologist was simply curious but oxygen levels back 65 million years ago was in the 28+% ball park, enabling larger animals with their respiratory systems to survive. Today we are at 21%...
Can you imagine a camp fire in a 28% atmosphere
