Dear Pete;-
As usual, you are right on the button.
I do the Epitoniidae. I cannot distinguish E. minora from E.
philippinarum. Most people can't. BUT Helen DuShane and a few other
gurus CAN. It's distinguished in our book, "The Wentletrap book"; but I
would still shy away from identifying one from another for a friend.
Art "The Honest"