Pirate Spider ?

[Rafael Passoni]

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I found this spider in my house. She always preys other spider (Steatoda sp in this pic). Is she Platnickina sp?
I live in Brazil (São Paulo) and I never saw this type of spider here.

[PaleoEuropean]

Looks kinda like a brown widow

[Rafael Passoni]

I found she eating an adult brown widow female, she is tiny.

[Ülev]

kitty kitty