Nomenclature in taxonomy

Hello!
Good afternoon, everyone. Could someone help me with the following? When we visualize the taxonomy (barplot), what is the difference between unidentified and -? Do they mean the same thing? Thank you very much!

Hi @blues!

  • “Unidentified” is a label that would come from the database, so indicates that that sequence is not annotated by that database, not an issue with the classifier.
  • “Unclassified” indicates that the classifier could not classify the sequence at even kingdom/domain level… see the taxonomy topics here for details: Best of the QIIME 2 Forum

The meaning of other “empty” labels is here:

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Thank you very much!

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