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Crab Spider?? - Mastophora cornigera

Crab Spider?? - Mastophora cornigera
North Scottsdale, Maricopa County, Arizona, USA
March 17, 2011
This was on my Purple Plum tree last night and I have no idea what it is. When you get close to it, it would pulse. Have Tried to get other pictures of it with his legs all open, but he seems to like this defensive stance. His body is the white thing, his legs are wrapped around his head. What is this???

Moved from Bolas Spiders. Based on recorded range for all species in this genus only M. cornigera is found in CA & AZ.

Moved from ID Request.

Thank you!!
Thanks to all of you for your help!!! It's nice to know what she finally is! She does have one sticky web!!

it reminded me of a bolas spi
it reminded me of a bolas spider before i looked at the comments.

if it is, EXCITING! see if you can catch a quick hunting video or something :)

Even more exciting!
A Bola spider in the genus Mastophora.

Edit: Ah! we matched with Max.

You need to go out in the evening and see if you can catch her with her bolas rope of sticky web hanging down ready to throw at an unsuspecting moth flying by!

Mastophora leucabulba

Edit - This may be a different species. Tha guide page says "Found only in southern Texas - alvareztoroi, leucabulba"

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