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Herennia sp.
Scary looking spider with perforated back (abdomen)
Easily found behind the tree bark. They spin their web along the tree bark and live peacefully with weaver ant, naked slug, and millipedes.
This badass looking spider actually cannot harm human because of their tiny size.
LennyWorthington, thx for the suggestion.
I agree with your identification. Because when i read the description, i found that another stigmata of this family is its double tail. I remembered that I found some specimens have these features. At the first time I think it the male's feature because the specimen which have "tail" is smaller than this one. Unfortunately, I didn't capture it.