All you need is a chicken neck and a string.

Same family but not a blue crab, but you eat them as if it were, not a calico either, I believe it's a variety of "swimming crab" , of which theres a number of varieties all over the world.

I fish blue crabs all summer and almost never eat the darn things... not worth the trouble...

Not a blue crab I've ever seen and I was a commercial crabber for about five years. Look and the ones in the basket DelewareBob posted. They are blue crabs.

Where were you when you found the crab? It is shaped like our blue crab, but not colored like one.