PlanetCatfish.com

I've been looking to learn more about catfish barbels but I can't find any good sources that give them a general treatment.

I am interested in variations in barbel morphology in catfish and the phylogeny of these changes.

Any suggestions?
Thanks!

Are any of these links of any assistance? : -
http://www.springerlink.com/content/u650u62m512nvm47
http://www.springerlink.com/content/n97445v06522u206
http://www.springerlink.com/content/u7h30tx8218x6w45
http://www.ingentaconnect.com/content/b ... 4/art00006
http://www.nature.com/nature/journal/v1 ... 343a0.html
http://ajplegacy.physiology.org/cgi/con ... /174/1/146
http://www.ncbi.nlm.nih.gov/sites/entre ... etrieve&db

fantastic! thanks!