Editing Cetacea (section)

=== Internal phylogeny ===

{{Further|List of cetaceans|List of extinct cetaceans}}

Within Cetacea, the two [[parvorder]]s are [[baleen whales]] ([[Mysticeti]]) which owe their name to their baleen, and [[toothed whales]] ([[Odontoceti]]), which have teeth shaped like cones, spades, pegs, or tusks, and can perceive their environment through [[Animal echolocation|biosonar]].{{citation needed|date=October 2024}}

{{Cladogram
|title=<small>Relationship of extinct and extant cetaceans<ref>
{{cite journal
 |author1=Gatesy, John       |author2=Geisler, Jonathan H. 
 |author3=Chang, Joseph      |author4=Buell, Carl 
 |author5=Berta, Annalisa    |author6=Meredith, Robert W. 
 |author7=Springer, Mark S.  |author8=McGowen, Michael R. 
 |year=2012
 |title=A phylogenetic blueprint for a modern whale
 |journal=[[Molecular Phylogenetics and Evolution]]
 |volume=66  |issue=2  |pages=479–506
 |doi=10.1016/j.ympev.2012.10.012  |pmid=23103570
 |url=https://www.montclair.edu/profilepages/media/5008/user/Gatesy_et_al._2012_A_phylogenetic_blueprint_for_a_modern_whale.pdf |archive-url=https://web.archive.org/web/20130227091508/https://www.montclair.edu/profilepages/media/5008/user/Gatesy_et_al._2012_A_phylogenetic_blueprint_for_a_modern_whale.pdf |archive-date=2013-02-27 |url-status=live
 |access-date=4 September 2015
}}
</ref></small>: 
|caption={{center|† Extinct taxa}}
|align=left
|cladogram=
 {{Clade
 |style=font-size:85%;line-height:100%;width:580px;
 |label1=
 |1={{Clade
    |1=[[Raoellidae]] †
    |label2='''Cetacea'''
    |2={{Clade
       |1=[[Pakicetidae]] †
       |2={{Clade
          |1=[[Ambulocetidae]] † [[File:Ambulocetus BW.jpg|50 px]]
          |2={{Clade
             |1=[[Remingtonocetidae]] † [[File:Remingtonocetus cropped.png|50 px]]
             |2={{Clade
                |1=''[[Rodhocetus]]'' †
                |2={{Clade
                   |1=''[[Dorudon]]'' †
                   |2={{Clade
                      |1=''[[Basilosaurus]]'' † [[File:Basilosaurus cropped.png|50 px]]
                      |2={{Clade
                         |label1=[[Mysticeti]]
                         |sublabel1=([[baleen whales]], 25 mya)
                         |1={{Clade
                            |1=''[[Janjucetus]]'' †
                            |2={{Clade
                               |label1=[[Balaenidae]]
                               |1=[[Balaenidae|Right whales]] [[File:Balaena mysticetus NOAA.jpg|50 px]]
                               |2={{Clade
                                  |label1=[[Neobalaenidae]]
                                  |1=[[Pygmy right whale]] <span style="{{MirrorH}}">[[File:Caperea marginata 3.jpg|50 px]]</span>
                                  |2={{Clade
                                     |label1=[[Balaenopteridae]]
                                     |1=[[Rorqual]]s [[File:Megaptera novaeangliae NOAA.jpg|50 px]]
                                     |label2=[[Eschrichtiidae]]
                                     |2=[[Gray whale]]s [[File:Eschrichtius robustus NOAA.jpg|50 px]]
                                     }}
                                  }}
                               }}
                            }}
                         |label2=[[Odontoceti]]
                         |sublabel2=([[toothed whales]])
                         |2={{Clade
                            |1={{Clade
                               |label1=[[Kogiidae]]
                               |1=[[Dwarf sperm whale]]s [[File:Kogia sima (transparent background).png|50 px]]
                               |label2=[[Physeteridae]]
                               |2=[[Sperm whale]]s [[File:Physeter macrocephalus NOAA.jpg|50 px]]
                               }}
                            |2={{Clade
                               |label1=[[Platanistidae]]
                               |1=[[South Asian river dolphin]]s [[File:Ganges.png|50 px]]
                               |2={{Clade
                                  |label1=[[Ziphiidae]]
                                  |1=[[Beaked whale]]s [[File:Ziphius cavirostris NOAA.jpg|50 px]]
                                  |2={{Clade
                                     |label1=[[Inioidea]]
                                     |sublabel1=(South American<br/>river dolphins)
                                     |1={{Clade
                                        |label1=[[Lipotidae]]
                                        |1=[[Yangtze river dolphin]] [[File:Lipotes vexillifer.png|50 px]]
                                        |2={{Clade
                                           |1=[[Iniidae]] [[File:Inia geoffrensis.jpg|50 px]]
                                           |2=[[Pontoporiidae]] [[File:Pontoporia blainvillei.jpg|50 px]]
                                           }}
                                        }}
                                     |label2=[[Delphinoidea]]
                                     |2={{Clade
                                        |label1=[[Delphinidae]]
                                        |sublabel1=("true" dolphins)
                                        |1=[[Oceanic dolphins]] [[File:Orcinus orca NOAA 2.jpg|50 px]]
                                        |2={{Clade
                                           |label1=[[Monodontidae]]
                                           |1=[[beluga whale|Belugas]] & [[Narwhal]]s [[File:Delphinapterus leucas NOAA.jpg|50 px]]
                                           |label2=[[Phocoenidae]]
                                           |2=[[Porpoise]]s [[File:Vaquita swimming through the void. (Phocoena Sinus).png|50 px]]
                                           }}
                                        }}
                                     }}
                                  }}
                               }}
                            }}
                         }}
                      }}
                   }}
                }}
             }}
          }}
       }}
    }}
 }}
}}
{{clear}}

The terms ''whale'' and ''dolphin'' are informal:

*[[Mysticeti]]:
:*[[Whale]]s, with four families: [[Balaenidae]] (right and bowhead whales), [[Cetotheriidae]] (pygmy right whales), [[Balaenopteridae]] (rorquals), [[Eschrichtiidae]] (grey whales)
*[[Odontoceti]]:
:*[[Whale]]s: with four families: [[Monodontidae]] (belugas and narwhals), [[Physeteridae]] (sperm whales), [[Kogiidae]] (dwarf and pygmy sperm whales), and [[Ziphiidae]] (beaked whales)
:*[[Dolphin]]s, with five families: [[Delphinidae]] (oceanic dolphins), [[Platanistidae]] ([[South Asian river dolphin]]s), [[Lipotidae]] (old world river dolphins) [[Iniidae]] (new world river dolphins), and [[Pontoporiidae]] ([[La Plata dolphin]]s)
:*[[Porpoise]]s, with one family: [[Phocoenidae]]
The term 'great whales' covers those currently regulated by the [[International Whaling Commission]]:<ref name=iwcjuris>{{cite web |title=Small cetaceans |website=iwc.int |publisher=[[International Whaling Commission]] |url=https://iwc.int/smallcetacean |access-date=2018-04-08}}</ref> the Odontoceti families Physeteridae (sperm whales), Ziphiidae (beaked whales), and Kogiidae (pygmy and dwarf sperm whales); and Mysticeti families Balaenidae (right and bowhead whales), Cetotheriidae (pygmy right whales), Eschrichtiidae (grey whales), as well as part of the family Balaenopteridae (minke, Bryde's, sei, blue and fin; not Eden's and Omura's whales).<ref name=iwcgreat>{{Cite web |title=Lives of Whales |website=iwc.int |publisher=[[International Whaling Commission]] |url=https://iwc.int/lives |access-date=2018-04-08}}</ref>