How many variation of Naso Tang?

[davelin315]

As far as naso tangs are concerned, I think there are many that are considered to be in the same family and genus, but there are really only two, the common and the blonde as far as I am concerned, the rest are all referred to by a different common name.

 

[Henry1]

I saw this juvenile Naso tangs at the LFS and thought of getting them.
The owner told me they are the 'silver backed' type and not the 'golden-backed type' when mature.

I was wondering is it true. I thought there is only one type - golden backed when adult.

Can someone tell me more?

Cheers