I probably should have told you how to tell C. maculifera from C. arabica. The easiest way is to look at the bottom of the shell. The black blotch on the columellar side of the base (right beside the teeth) is characteristic of C. maculifera. If it doesn't have that blotch but otherwise looks like it, it's probably C. arabica. See:
Mauritia maculifera maculifera
Cheers again,
Don