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Branchinecta spp.
Found in a freshwater oxbow in southern Indiana.
Very likely a Branchinecta species. Typically, characteristics such as antennae shape and egg pouch shape are used to identify to species. I used to conduct surveys in California vernal pools. Several Branchinecta species there have been listed as threatened or endangered as a result of habitat loss to agriculture and urban development.
I don't know if these are Sea Monkeys because I found them in freshwater in Indiana. Sea Monkeys tend to be found in salt water.