+1 You need to look for hooks under the first set of legs. I can't really tell from your picture, but it doesn't look like a MM, you'll just have to check for the hooks. If you do find hooks, then I would take it back to the store and make a case unless you just want to keep it. How much did you pay for it?Does your spider have a hook on the underside of each front leg just past the second joint from the "toe"end? If so, you have a MM. Abdomen size and legginess is not really an accurate indication of sex in immature Ts IME.