Hy,
I definitely defer to David on all the Bio questions.
I would say copepods are like little spheres, not flattened in any way. I agree with David that it's a bit vague to say "pod". Although it usually is referring to amphipods and copepods, it could just as easily mean stomatopods, decapods, etc.
FWIW, there are some temperate water amphi- and isopods out here in Bodega Bay that are big enough to be a single meal for some of my fish.