Hi and welcome to Planet Catfish!
You would probably get the best results in this forum viewforum.php?f=6
But no worries we are not that mean here
Many cories have different adult sizes if you go here http://www.planetcatfish.com/catelog/ge ... genus_id=1
and look around you will see what I mean.
Measurement are usually given in SL which is from the tip of the snout to base of tail.
Cories are not really my thing so I can not help you with the specific cory in your picture but I am sure someone will come along who can.