You'd be right. Other species can be lefties, but they're very, very rare. I have a big honkin' lightning whelk myself, a proper barnacled leftie at 12 inches in lengthI love lightning whelks ~ it's my understanding that they are the only species that is "left handed", meaning when you are looking at the opening of the whelk, it curves in from the left. All other types of spiral species curve in from the right. And, well, birds of a feather and all that ~ lefties stick together