this thread has been posted out of curiosity and confusion. I know how to tell a bimaculoides from a bimaculatus. and a merc would stick out like a sore tentacle in a crowd of joubinis, but the one spiecies that has me stumped is vulgaris and well... everything else. octopus aculatus (forgive me if i messed that name up) is especially confusing. also, what is the difference between a mimic and a wonderpus?