In my bussiness (lab monkey, bug picker, or technician) anything you can see with a dissecting scope is a macro-invertebrate, including rotifers and cladocerans.
Some scientists believe that ephippia can remain viable for a decade, and since cladocerans reproduce asexualy, only one needs to get into a lake.
Most other inverebrates, aka all of the insects, have adult stages that fly and can lay eggs in new lakes.
