Original: Pilot whales are classified into two species, the long-finned pilot whale (Globicephala melas) and the short-finned pilot whale (Globicephala macrorhynchus).
Simplified: Pilot whales are two types of oceanic dolphins, whose scientific name is Globicephala. The two types of pilot whales are the Long-finned Pilot Whale and the Short-finned Pilot Whale.