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Crab Spider - Misumessus oblongus

Crab Spider - Misumessus oblongus
Radford, Virginia, USA
August 9, 2012
I'd like an ID, please. I think that this is a crab spider, and I think that it is on Eupatorium purprueum.


What criteria are you using to ID this specimen? For comparison, here is a Misumena vatia from the UK, where there are no Misumessus. It looks like the BG crew is assigning to Misumessus many that I couldn't.

No comment ...
on placing to species, I haven’t looked at these in a long while and know there may be others undescribed... just regarding the UK one, the more opaque smudge of white on the carapace is what would’ve made me think that one was M. vatia.

I've noticed that smudge over the years but haven't been consciously testing whether it might indicate Misumena vatia. In order for it to indicate M. vatia, all Misumessus-like M. vatia must always exhibit the mark, otherwise we might call M. vatia without the mark Misumessus. Thanks, I'll pay more attention to it moving forward.

Look-alike update
FYI, the spider that I had that looked like this made an egg sac this morning. She shrunk quite a bit and no longer looks like this. Now she has an elogated, diamond-shaped abdomen, which is the trademark of Misumessus oblongus. But we can wait until I do the dissection before we file these possible Misumessus. I believe the coloration is distinctive for Misumessus.

That also means that I've had an adult all along and didn't know it. Misumessus has an epigynum whose openings cannot be seen, which would explain why I've been assuming that she was immature. All signs point to Misumessus so far. One more sign to check.

Moved from Spiders.

Possible Misumessus for now?
The abdomen is a bit overexposed and I can't tell the color. If it's green, it probably looks very similar to a spider that I'm now raising to adulthood, also from Virginia. Can we move it to "possible Misumessus" for now, where we're collecting others of the greenish ilk? If the one I have turns out to be Misumena vatia, we can probably just move them all then.

Joe, the color was a very pale olive green. I had to use my flash to get a photo of the little critter and the flower so every thing was overexposed..

Okay thanks. Yes, that's the color of my specimen here. We've got a number of photos of spiders having the proven Misumessus abdomen coloration but with something more of a Misumena abdomen shape. Hopefully I can get this one to adulthood. I'm only have success feeding her flies, not crickets, like the other Misumessus I've raised. (I've never gotten my hands on a Misumena vatia, though, unless this is one.)

Moved from ID Request.

Looks like Misumena vatia to us
but let's see what others think.

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