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Photo#265880
If this is a scale insect, it is enormous - Icerya

If this is a scale insect, it is enormous - Icerya
Saguaro National Park West, Pima County, Arizona, USA
April 13, 2009
Size: 9mm
On acacia. It has legs, but is attached to the branch with its underside.

Images of this individual: tag all
If this is a scale insect, it is enormous - Icerya If this is a scale insect, it is enormous - Icerya If this is a scale insect, it is enormous - Icerya

Placement
These images are currently placed at genus level (Icerya). There appear to be only two North American species in this genus--the cottony cushion scale (I. purchasi), which I don't think it is, and I. rileyi, which is pictured here. Of course, there could well be other species in southern Arizona that aren't listed in Nomina Nearctica. It seems to me these would be better placed at family level, though, if the insect has not been conclusively identified as one of these two species.

 
Actually, the insect in the photo you link to
looks very much like mine - the white stuff is being produced and pushed out and the animal that does it is black and white. The hostplant Psorothamnus is a leguminose closely related to the acacia that I found mine on. So it could well be I. rileyi. I'll try to find out more, maybe at the UoA

Yes, female scale.
She is constructing an egg case, it would appear, behind her. Something on the order of the "cottony cushion scale," family Margarodidae. Neat find.

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