We found it ressembled a lot to T. sirtralis sirtralis and a little to T. radix, i donīt think it looks like T. marcianus because it hasnīt a darker neck. (those iīve seen them before), i īll try to get more pics. soon.
I know Mexico isnīt a native place for T. sirtralis sirtralis and T. radix, thatīs why itīs so confusing, and yes, itīs not easy to move species between countries, there are lots of sanitary and conservation issues.