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Giant Aphid - Longistigma caryae

Giant Aphid - Longistigma caryae
Montrose, Laurens County, Georgia, USA
November 21, 2009
Is this Bark or Willow aphid? My pic shows differences from as well as similarities to both species. I have pics of a herd, with its attendant "cowboy" ant, of this same animal. This particular specimen is somewhat larger than the ones in the herd. I forgot to take a measure on this beastie, sorry. Also, is it male/female if it even pertains or an adult?

Moved from Giant Aphids.

Giant willow aphid (Tuberolachnus salignus) has a big dark dorsal tubercle, kinda like a horn in the middle of its back, which this specimen does not have.

Moved from ID Request.

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