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Photo#1106693
Swift Crab Spider in Yellow - female

Swift Crab Spider in Yellow - Female
Tonopah Desert, Maricopa County, Arizona, USA
April 20, 2015
Size: 5.8mm
These are images of what I believe is a female all-yellow version of a Swift Crab Spider, Mecaphesa celer.

Please confirm, move or frass these images. Thanks for your help!

Images of this individual: tag all
Swift Crab Spider in Yellow - female Swift Crab Spider in Yellow - female Swift Crab Spider in Yellow - female Swift Crab Spider in Yellow - female

Moved
Moved from Spiders.

Moved
Moved from ID Request. The only other one I think we need to consider is M. oblongus.

 
Testing for Misumessus oblongus
This is from the info page for the genus Misumessus:
(1) Posterior of abdomen is diamond-shaped and not rounded. = FAIL
(2) Posterior of abdomen has a look like it's made of stacked layers, the way Misumenoides formosipes abdomens do. = FAIL?
(3) Abdomen is somewhat flattened and has a sense of projecting more away from the cephalothorax than over it ("oblong"). = FAIL
(4) The Misumessus in my area... = ?
(5) Like Misumena, but unlike Mecaphesa, Misumessus has a pattern of apodemes (dimples) on the abdomen. = FAIL

After looking at this test, what do you think, haha? Thanks

 
=] abdomen
tests often can't be used when the spider is gravid. Any front views of the eyes? For what it's worth I'm not really thinking it's Misumessus.... just making sure we've considered everything.

alternatively
maybe an all yellow Misumena vatia?? BugGuide has only a few photos of Mecaphesa celer but the area around the eyes in M. vatia seems to be colored more like your spider than M. celer – I think (famous last words).
Either way it's a win because you either have something BugGuide has only a few photos of or you have BugGuide's first Arizona record for the other.

I guess we'll see what the experts call it. As long as it doesn't turn out to be a grasshopper, we're both okay

 
Ruled it out already!
Steve, I looked at those spiders and ruled them out based on:
1) lack of large abdominal dimples
2) overall hairiness, mostly around the eyes
3) abdominal trapezium (4 to 6 pale dots) point or converge toward the spinneret.

Thanks for your assistance!

 
thanks
for the pointers, much appreciated

 
thanks
but which did you rule out? I assume it was M. vatia. Which characteristics did you use to rule it out - I might as well learn something

 
I was editing, sorry!
Also, if you check, the image for the yellow spider on the info page for Misumena vatia is now placed in Misumessus oblongus, haha! That was confusing.

 
this one's almost all yellow
, almost anyway :-)
I was actually looking at plate 74 in Bradley's Common Spiders of North America(1) which shows an all yellow M. vatia among other variations. It's a good book but, to be honest, I've been fooled by those illustrations before. The colors are sometimes off in confusing ways

 
Great one from Lynette!
Yes, that is a good image for that species. You can see five large dimples and also two smaller ones, with two more little dots closer to the spinneret. Now, check the two in the middle of the abdomen and the two just below them, that form a squared box shape. These are the points where the trapezium dots show up. Sometimes they are dark spots and sometimes they are pale spots. This image shows them a little clearer than mine and you can see the shape of it better:


Also, the overall shape of the abdomen is more ovoid than most of the related genera and it rises farther above the carapice.

 
Thanks!
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