There are four different kinds of crabs that all morphed from proto-arachnids into crabs along different paths. Given enough time, all is crab.
Madness string 102452
The more you think about it, the more you realise all vampire rules are just anti-Italian rules. Can't eat garlic? IN ITALY? Can't go out in sunlight? IN ITALY? Can't go near crucifixes? IN ITALY? Can't cross running water? IN ITALY?