The suborder Odontoceti, consisting of about 66 species. Families are: Physeteridae - Sperm Whales - 3 species Ziphiidae - beaked whales - 18 spp. Delphinidae - oceanic or marine dolphins - 32 spp. Monodontidae - beluga and narwhal - 2 spp. Platanistidae - freshwater or river dolphins - 5 spp. Phocoenidae - porpoises - 6 spp.