I think this is a false black widow.
Found inside door recess in glasshouse, living in door keyhole
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Apr 18, 2024
Apr 18, 2024
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Petaluma,
Steatoda paykulliana or Steatoda bipunctata.
You know Steatoda well. Could this be S. parkulliana because there are faint lines on the sides?
Most likely S. paykulliana but I don’t have much knowledge about S. bipunctata so I’m not sure.
Looks like S. bipunctata has more light brown abdomen and has a marking on abdomen.
S. bipunctata pics:
https://araneae.nmbe.ch/gallery/photos/73
https://www.inaturalist.org/taxa/146685-Steatoda-bipunctata/browse_photos
I am pretty sure this is Steatoda nobilis. It looks to me to have a washed out version of this pattern..https://www.museum.ie/en-IE/Collections-Research/Registration-Department/Registration-Blog/The-Widows-Arrival. They loose their pattern with each successive molt.
I commented but it says “Awaiting for approval” so I’m commenting again:
Picture you sent shows an adult S. nobilis. Yes, some specimens can be found with less white patterns(For example: https://www.inaturalist.org/observations/130526388) but most of their abdomen is still white and abdomen’s sides are white.
S. paykulliana females with white patterns looks a lot more matching.
Steatoda have their markings as indentations in their chitin. I see the shape of the markings of S. nobilis indented into this spider. That is why I chose that as the identification.
Thanks for the ID!
Also, people on iNat confirmed my S. paykulliana female observation was an adult female. Can you ID my picture?
Yes, I am happy to do it
Thanks!