What 2 families are dolphins divided into?

There are 33 species of marine dolphins, 4 species of river dolphins and 6 species of porpoises Dolphins: Atlantic White Sided Dolphin Atlantic Hump-Backed Dolphin Atlantic Spotted Dolphin Black Dolphin Bottlenose Dolphin Clymene Dolphin Commerson's Dolphin Dusky Dolphin False Killer Whale Frasier's Dolphin Hector's Dolphin Heaviside's Dolphin Hourglass Dolphin Indo-Pacific Hump-Back Irrawaddy Dolphin Long-Beaked Common Dolphin Long-Finned Pilot Whale Long-Snouted Spinner Dolphin Melon-Headed Dolphin Northern Right-Whale Dolphin Orcas (Killer Whale) Pacific White-Sided Dolphin Pantropical Dolphin Peale's Dolphin Pygmy Killer Whale Risso's Dolphin Rough Toothed Dolphin Southern Right-Whale Dolphin Short Beaked Common Dolphin Short Finned Pilot Whale Striped Dolphin White Beaked Dolphin River Dolphins: Baiji, or Yangtze river Dolphin Boto, or Amazon River Dolphin Franciscana or La plata Dolphin Indus & Ganges River Dolphin Porpoises: Burmeister's Porpoise Dall's Porpoise Finless Porpoise Harbor Porpoise Spectacled Porpoise Vaquita Porpoise.

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