Lithodid-Man has consistently brought unanswered science in to what has otherwise been a pretty grotty thread, all his posts in this thread have been of a high standard but this foray into the details of Decapod taxonomy is exemplary.
Sometimes you see a post of such brilliance and simplicity you wish you'd made it first, this is just such a post. In just two sentences, and four photos NosyNed brilliantly, concisely and incisively sums up the flacid weakness of Calypsis4's argument.