Aphid Wolf attacks Ant Cows

Aphid Standoff
Dear Bugpeople,
I believe that the red bugs are aphids, but what is the segmented “thing” they are facing? It’s about 3⁄4” long. This scene was captured In a St. Louis, MO garden.
Thanks for your help.

Hi Henry,
We will be posting your spectacular photo on several of our pages, including the Food Chain. Your photo shows the drama when a Green Lacewing Larva, known as an Aphid Wolf, attacks a group of Aphids, sometimes called Ant Cows. The term Ant Cow refers to a symbiotic relationship with ants who milk the Aphids for honeydew.

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