2) Square Crab
3) Cartwheeling Crab
4) Thorny Crab
9&10) Bridge Crabs, a brand-new group of crustaceans with laterally stretched bodies (the opposite of bar crabs).
6) Shrimp-like Crustacean with large telson and pincers. Strong swimmer.
7) Tiny, transparent, pelagic crustacean with no legs that swims with its muscular antennae. Its eyes are large, but its pigmented retinal cells are few and far between, making them close-enough to transparent, making it invisible to certain predators.
5) Highly modified lobster covered with highly toxic (and colorful) skin.
8) Another highly modified toxic lobster. This one folds up its back end and spreads its back legs (highly modified swimmerettes) to cover it, keeping its back end to predators. It is the back end that is covered with highly toxic mucus and is brightly colored.
11) A crustacean or related arthropod with a body flattened in such a way to resemble (and swim like) a fish. It is the third-dimension equivalent of bar crabs and bridge crabs.