The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
To be totally honest, I've not spent much time trying to classify them. My thoughts would be more towards Orconectes virilis, which is the native species around here. But hard to say for sure. I'm not sure the purple clawed is actually a different species, as I read quite a bit that would indicate the color variations are at least to some degree brought about by differences in chemical present in the water column.
Very cool! Those are great photos. My old Crayfish did that once, except he was on the floor in the hallway (he had escaped during the night, but we put him back in the tank and he survived)