https://sites.google.com/site/catalogodearanasdeargentina/lista-de-especies/theridiidae I think your spider is in genus Theridion. Unfortunately the link I added doesn’t have photos.
https://sites.google.com/site/catalogodearanasdeargentina/lista-de-especies/theridiidae I think your spider is in genus Theridion. Unfortunately the link I added doesn’t have photos.