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Photo#83804
Holy palps, Batman! - Steatoda borealis - male

Holy palps, Batman! - Steatoda borealis - Male
Herndon, Fairfax County, Virginia, USA
October 13, 2006
I'll admit it - his relative size impressed me! ;-)

This spider has been looking really decrepit for a while, and, in fact, may no longer be with us at this point. The first time I saw him, he was balled up in the "dead spider pose" on the floor by the baseboard, but I blew on him and he moved. Much to my surprise, a couple days later I found him off the floor in this web, so I took this photo. A few days later he was back on the floor in a crumpled pose.

I don't know if it can be told from this photo, but is he a steatoda? He was near at least one female and a couple others of (at this point) undetermined gender who I think are steatodas. I think I have a photo of him at home in his crumpled pose - I'll try to post that as well - maybe his back can be made out in that one.

Images of this individual: tag all
Holy palps, Batman! - Steatoda borealis - male Holy palps, Batman! - Steatoda borealis - male

starved
It's a starved subadult male, and you are right about Steatoda. Can't say which species but at least it is in the bipunctata group (sensu Levi).

 
He must have been really weak
because in the other photo, there's a carpet beetle larva right off the right edge of the photo - practically in reach to him - and he didn't go after it.

How can you tell adult vs. immature with spiders? Also, he was fairly near to this female, so I was wondering if they were related species-wise or if it was just coincidental.

Thank you for your response, by the way. =)

 
Steatodas normally are not in
Steatodas normally are not interested in prey if it is not in their web. This male is subadult because it has really swollen pedipalps but no clearly visible complex structure. The instar before subad. has normally also slightly swollen tips of the pedipalps. The female you have is an adult with clearly visible epigyn on the ventral side of the abdomen. It is probably of the same species as your male. The female looks like S. bipunctata, but S. borealis and apparently also S. hespera are very similar. I don't know if all three spp. occur in your area.

 
Aha, so that's what the structure is on her.
Thanks for the lessons. =) I'll have to look into those species to see if I can figure this out.

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