What are some different types of dolphins?

Here are A LOT of types of dophins:

the Bottlenose dolphin, the Killer Whale, the Common dolphin, the False Killer Whale, the Hector's dolphin, the Short-Finned Pilot Whale, the Commerson's dolphin, the Long-Finned Pilot Whale, the Black dolphin, the Atlantic Humpbacked dolphin, the Haeviside's dolphin, the Indo-Pacific Humpbacked dolphin, the Southern Right Whale dolphin, the Tucuxi, the Northern Right dolphin, the Pygmy Killer Whale, the Spotted dolphin, the Melon-Headed Whale, the Atlantic Spotted dolphin, the Irrawaddy dolphin, the Striped dolphin, the Rough-Toothed dolphin, the Spinner dolphin, the Risso's dolphin, the Clymene dolphin, the Fraser's dolphin, the White-Beaked dolphin, the Peale's dolphin, the Atlantic White-Sided dolphin, the Hourglass dolphin, the Pacific White-Sided dolphin and the Dusky dolphin.

Here are some river dolphins:

the Amazon River dolphin, the Chinese River dolphin, the Ganges River dolphin, the Franciscana and the Indus River dolphin. As you have probably noticed, the name of the species of these dolphins is related to the waterway that represents their habitat!

Hope this helped :D