Difference between Steatoda grossa vs triangulosa

[CRX]

I'm having trouble figuring out which one of these I have, does anyone have any tips? thank you

Okay so I am fairly sure I have a triangulosa on my hands. Im a little disappointed, I wanted a nobilis/grossa because they allegedly get bigger lol. The triangle markings are pretty obvious.

 

[zsiciarz]

That indeed looks like a young Steatoda triangulosa. With S. grossa, the pattern on the abdomen is usually clearly separated, while the bright markings are often connected in the case of S. triangulosa.
See also: https://wiki.arages.de/index.php?title=Steatoda_triangulosa