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Photo#1593917
Aphids&Ants - Aphis

Aphids&Ants - Aphis
Newburyport/Joppa Flats Education Center, Essex County, Massachusetts, USA
September 20, 2018
I'm thinking these are Aphis fabae, on Chenopodium (berlandieri), being tended by Labor Day Ants. The habitat is the upper fringe of the tidal marsh.

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Aphids&Ants - Aphis Aphids&Ants - Aphis Aphids&Ants - Aphis Aphids&Ants - Aphis Aphids&Ants - Aphis

Moved
Moved from Aphids.

Most likely
Species of Aphis are annoying to separate, especially with apterae, and the single specimen in the dorsal shot is immature so its really lacking any helpful characters. The close up of the leg and back end is an adult and the cauda does look like what you'd expect to see in A. fabae. I usually ID A. fabae based on the dorsal sclerotization (which is really tough to see when they're not cleared and slide mounted), sclerites around the siphunculi, and shape/size of the lateral abdominal tubercles on abdominal segment VII, shape of the cauda and number of hairs on the cauda. So they have the general look of Aphis fabae, but some other similar species of Aphis (A. solanella for example) will colonize the same host so can't be 100%.

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