The black panther is in fact the colour variant of your leopard (Panthera pardus) along with the jaguar (Panthera onca). Black panthers of both of those species have excessive black pigments, but their usual rosettes can also be present. It’s just they can no longer be very easily observed. From https://mypresspage.com/story4133698/the-smart-trick-of-baby-black-panther-for-sale-that-nobody-is-discussing