OTU Species Level


I used Silva reference database in align.seqs to classify my 454 sequences. In the final file, the last level is genus.
Is there any way to do the classification at species level?


You would need to supplement the reference database with species level information. There is widely held skepticism that one can really assign a 16S rRNA gene fragment to a species in the first place, so this might be a bit of a waste of time.