By the Carboniferous, all the other major groups of crustaceans are present except for the Eucarida.
'Group' is, of course, a fairly vague concept. The quote above may leave you thinking that there is only one small, obscure group of crustaceans we don't find in Carboniferous rocks. Eucarida is, however, a vast and enormously diverse group. It includes almost every animal the average person would think of when you said 'crustacean' - crabs, lobsters and shrimps are all Eucaridans. And none are ever found in pre-Jurassic rocks, anywhere in the world.
So next time YOU don't understand, don't pretend that is because of my stupidity. If YOU don't understand then YOU are the one that doesn't have a basic grasp of deductive reasoning. For if identical animal kinds don't count as evidence kinds have remained unchanged, then please show me how to qualify evidence for baramins. There is only one other option according to the law of the excluded middle, and that is that the fossils would, "not" look the same.
But that is the whole point of this thread, that rocks of different ages contain different assemblages of fossils. Lobsters are never found in rocks older than the Cretaceous; trilobites are never found in rocks younger than the Permian. A fact wholly unexplained from the creationist point of view.