This is the largest group of whales and contains the majority of species.
    They have teeth, not baleen plates, and they differ from the other suborders in the arrangement of their nasal passages and blow-holes. They have only a single nostril.
    The two parts of the nasal apparatus have joined at the external end to form a single opening.
    Most members of the Odontoceti are gregarious creatures which form a large herds. They keep in contact by an efficient use of sound. Their well developed hearing apparatus enables them to pick up squeaks from within the human range to ultrasonic noises. Like bats they send out sounds and can estimate the position of objects by analyzing the echo. To facilitate this, they move their heads from side to side as they swim. The great variety of sounds they make is an indication of real development of this sense, and its importance.

    THE ODONTOCETI IS MADE UP OF 10 FAMILIES:

    1. DELPHINIDAE, THE DOLPHINS:
    Atlantic Humpbacked Dolphin (Sousa teuszii)
    Atlantic Spotted Dolphin (Stenella plagiodon)
    Atlantic White-Sided Dolphin (Lagenorhynchus acutus)
    Black Dolphin (Cephalorhynchus eutropia)
    Bottlenose Dolphin(Tursiops truncatus)
    Clymene Dolphin (Stenella clymene)
    Commerson's Dolphin (Cephalorhynchus commersonii)
    Common Dolphin (Delphinus delphis)
    Dusky Dolphin (Lagenorhynchus obscurus)
    False Killer Whale (Pseudorca crassidens)
    Fraser's Dolphin (Lagenodelphis hosei)
    Indo-Pacific Humpbacked Dolphin (Sousa chinensis)
    Heaviside's Dolphin (Cephalorhynchus heavisidii)
    Hector's Dolphin (Cephalorhynchus hectori)
    Hourglass Dolphin (Lagenorhynchus cruciger)
    Irrawaddy Dolphin (Orcaella brevirostris)
    Killer Whale(Orcinus orca)
    Long-Finned Pilot Whale (Globicephala melaena)
    Melon-Headed Whale (Peponocephala electra)
    Northern Right Whale Dolphin (Lissodelphis borealis)
    Pacific White-Sided Dolphin (Lagenorhynchus obliquidens)
    Peale's Dolphin (Lagenorhynchus australis)
    Pygmy Killer Whale (Feresa attenuata)
    Risso's Dolphin (Grampus griseus)
    Rough-Toothed Dolphin (Steno bredanensis)
    Short-Finned Pilot Whale (Globicephala macrorhynchus)
    Southern Right Whale Dolphin (Lissodelphis peronii)
    Spinner Dolphin (Stenella longirostris)
    Spotted Dolphin (Stenella attenuata)
    Striped Dolphin (Stenella coeruleoalba)
    Tucuxi (Sotalia fluviatilis)
    White-Beaked Dolphin (Lagenorhynchus albirostris)

    All those species are described, including pictures!
    You'll find them at the main screen 'dolphins' when you move to 'different species'...

    2. KOGIIDAE, PYGMY SPERM WHALES:
    Pygmy Sperm Whale (Kogia breviceps)
    Dwarf Sperm Whale (Kogia simus)

    3.MONODONTIDAE, BELUGAS:
    Beluga(Delphinapterus leucas )
    Narwhal(Monodon monoceros)

    4. PHOCOENIDAE, THE PORPOISES:
    Small, with reduced beak and triangular dorsal fin if present.
    Burmeister's Porpoise (Phocoena spinipinnis)
    Cochito (Phocoena sinus)
    Dall's Porpoise (Phocoenoides dalli)
    Finless Porpoise (Neophocaena phocaenoides)
    Harbour Porpoise (Phocoena phocoena)
    Spectacled Porpoise (Phocoena dioptrica)

    5. PHYSETERIDAE, THE SPERM WHALES:
    Sperm whale(Physeter macrocephalus)

    6. PLATANISTIDAE, THE FRESHWATER OR RIVER DOLPHINS:
    Amazon River Dolphin (Inia geoffrensis)
    Chinese River Dolphin (Lipotes vexillifer)
    Franciscana (Pontoporia blainvillei)
    Ganges River Dolphin (Platanista gangetica)
    Indus River Dolphin (Platanista minor)

    7. ZIPHIIDAE, THE BEAKED WHALES:
    Andrew's Beaked Whale (Mesoplodon bowdoini)
    Arnoux's Beaked Whale (Berardius arnuxii)
    Baird's Beaked Whale (Berardius bairdii)
    Blainville's Beaked Whale (Mesoplodon densirostris)
    Curvier's Beaked Whale (Ziphius cavirostris)
    Gervais' Beaked Whale (Mesoplodon europaeus)
    Ginkgo-Toothed Beaked Whale (Mesoplodon ginkgodens)
    Gray's Beaked Whale (Mesoplodon grayi)
    Hector's Beaked Whale (Mesoplodon hectori)
    Hubb's Beaked Whale (Mesoplodon carlhubbsi)
    Longman's Beaked Whale (Mesoplodon pacificus)
    Northern Bottlenose Whale (Hyperoodon ampullatus)
    Southern Bottlenose Whale (Hyperoodon planifrons)
    Sowerby's Beaked Whale (Mesoplodon bidens)
    Strapthoothed Whale (Mesoplodon layardii)
    Stejneger's Beaked Whale (Mesoplodon stejnegeri)
    Tasman Beaked Whale (Tasmacetus shepherdi)
    True's Beaked Whale (Mesoplodon mirus)
     
    8. FAMILY SQUALODONTIDAE:
    Prosqualodon - a 7.5 feet (2.3 m) long extinct, toothed whale that resembled a dolphin. It dates from the Oligocene to the early Miocene. It had complex teeth, more like the Archaeoceti than the Odontoceti (the toothed whales).

    9. FAMILY EURHINODELPHIDAE:
    Eurhinodelphis - a 6.5 feet (2 m) long extinct, long-snouted porpoise with no teeth at the end of the snout. It dates from the mid to late Miocene. It has complex teeth, more like the Archaeoceti than the Odontoceti (the toothed whales).

    10. FAMILY PONTOPORIIDAE:
    Yangtze River Dolphin
    La Plata Dolphin

    OTHER FAMILIES:
    - Family Iniidae
    - Amazon River Dolphin (Inia geoffrensis) ???
    - Orcaelidae (also sometimes included in the delphinidae)
    - Globicephalidae (some classifications included this family in the delphinidae)
    - Grampidae, Risso's dolphin (also sometimes included in the delphinidae)

    The river dolphins are also described, you can also find them when you move to the main screen 'dolphins' and go to 'different species'