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					Originally Posted by  JDigital
					 
				 
				Percula have quite a bit thicker black "border" lines around the white sections. 1 Extra Dorsal Spine 11 compared to 10 (usually only countable when fully grown).  Some say they have different eyes as well but in my specimens I haven't seen that.  Not that I knew at the time of my post, but price also plays a role.  Ocellaris can be had for $20-25 whereas the usual price for a Percula is $40-45, CDN anyways.  Liveaquaria prices their Ocellaris @ $12.99 and the Percula are $21.99USD, so almost double.  
Hope that helps, couple pics just incase.    
Ocellaris Clown:
  
Percula Clown:
   
			
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 True percula's have 10 some times 9 dorsal spines but never 11. False Percula's have 11 dorsal spines all other feature can show up in either fish. the only true way to tell it the dorsal spines.
I have had both types and right now I have perculas 3 in total one in my kids tank is a miss barred one I like her best.
Bill