Answer:
There are only two species of bottlenose dolphins, the Common Bottlenose Dolphin (Tursiops truncatus) and the Indo-Pacific Bottlenose Dolphin (Tursiops aduncus).
Also, there are two recognized subspecies of Tursiops Truncatus:
The Pacific Bottlenose Dolphin (Tursiops Truncatus Gillii) which lives in the Pacific ocean.
The Black Sea Bottlenose Dolphin (Tursiops truncatus Ponticus) which lives in the Black Sea.