differences between clowns

I'm NO clown expert, the only difference I really know of is in coloration. True percs having a bit more contrast and being a little darker.
 
I read an article the other day, if I can find it I'll post a link.

The article stated that the different types had different levels of aggressiveness. Supposedly the maroon is the most aggressive of the bunch. The false perc being the least aggressive. Certain ones may also grow slightly larger than others. If you are trying to get a clown to pair up with an anemone, they have differing preferences.

I think it also said not to keep a false perc and a true perc in the same tank. But you could potentially keep two different colored true percs. If the tank is large enough.
 
Differences are specie to specie, or differences in genus, all are under the family of Pomacentridae. Geographic distribution, and/or isolation of a particular habitat, symbiotic relationship with Cnidarians in a particular habitat, with symbiotic relationships playing the most important role of speciation in clownfish.
I think there's 70(+/-) species of Amphiprion, 5 or so of Premnas.
Here's the fishbase.org on Amphiprion...
fishbase.org
And the wiki...
http://en.wikipedia.org/wiki/Clownfish
Lastly a field guide with a basic species identification key...http://www.nhm.ku.edu/inverts/ebooks/ch2.html#latez
 
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