I have one very similar to your Izzy she looks like this now. as far as types there are those they call the wild types but that's their coloring, solid blk with white on wing tips, here is my girl 1 yrs old
But Muscovy's are just Muscovy's Drake or Duck. They are not related to the wild mallard where all other domesticated ducks come from. when she was a baby At 4 weeks just a tad to young to tell gender yet. here was Sassy as a baby..