The same three genus belongs to different family

[Nicholas_Bokulich]

@Zhanzhan

Silva demands high ram and my device can not work if I use silva.

There are ways around this, see this post and the following post in the same topic:

Memory and Classification for 18S

Hi @fhermanto96, Have you tried try one of the newer SILVA 138 classifiers here: https://forum.qiime2.org/t/silva-138-classifiers/13131 They should have a smaller memory footprint... especially the versions of the classifiers which were made without the species label (only goes down to genus). -Mike