I just found a much older example of an ancient crab which has remained pretty much unchanged for some 445 million years.
For a species to have been around for so long... it is astounding. The history of man is but the blink of an eye. They will probably still be around long after we are gone.
Source:
http://www.sciencedaily.com/releases...0207135801.htm
EDIT: didn't get that one in, in time
