A black panther is typically a melanistic color variant of any Panthera species. Black panthers in Asia and Africa are leopards (Panthera pardus). Black panthers in the Americas are black jaguars (Panthera onca).
The person befor me commented "Black panther beauty. This is a jaguar with melanism. Melanism is a recessive black jeen, which makes the jaguar appear black. But, no jaguar is truly black, just a dark brown.