What is Cetacea?
{{taxobox | name = Cetacea | fossil_range = Early [[Eocene]] – Present | image = Humpback stellwagen edit.jpg | image_caption = [[Humpback whale]] breaching | regnum = [[Animal]]ia | phylum = [[Chordate|Chordata]] | classis = [[Mammal]]ia | infraclassis = [[Eutheria]] | superordo = [[Laurasiatheria]] | infraordo = '''Cetacea''' | ordo = [[Cetartiodactyla]] | subdivision_ranks = [[Suborder]]s | subdivision = [[Mysticeti]]<br /> [[Odontoceti]]<br /> †[[Archaeoceti]] }} [[File:Cetacea.jpg|thumb|260px|Some Cetacea: 1- [[Bowhead whale]]; 2- [[Orca]]; 3- [[Right whale]]; 4- [[Sperm whale]]; 5- [[Narwhal]]; 6- [[Blue whale]]; 7- [[Rorqual]]; 8- [[Beluga whale|Beluga]]]] The order '''Cetacea''' are [[ocean|marine]] [[mammal]]s that live in [[ocean]]s, [[sea]]s and even a few [[river]]s around the world. [[Whale]]s, [[dolphin]]s and [[porpoise]]s are part of this group. These common names refer to size: whales are the largest, porpoises the smallest. How and what they eat is a better guide to their relationships. The study of cetaceans is called [[cetology]]. Cetaceans are ocean creatures without toes, but are classified in the related order [[Cetartiodactyla]] because their ancestors were even toed ungulates. == Taxonomy == * Order '''Cetacea''' ** Suborder '''Mysticeti''': [[Baleen whale]]s *** Family '''Balaenidae''': Right whales and Bowhead whale **** [[Bowhead whale]], ''Balaena mysticetus'' **** Genus ''Eubalaena'': [[Right whale]]s ***** [[North Atlantic right whale]], ''Eubalaena glacialis'' ***** [[North Pacific right whale]], ''Eubalaena japonica'' ***** [[Southern right whale]], ''Eubalaena australis'' *** Family '''[[Balaenopteridae]]''': [[Rorqual]]s **** Genus ''Balaenoptera'' ***** [[Blue whale]], ''Balaenoptera musculus'' ***** [[Fin whale]], ''Balaenoptera physalus'' **** [[Humpback whale]], ''Megaptera novaeangliae'' *** Family '''Eschrichtiidae''' **** [[Gray whale]], ''Eschrichtius robustus'' *** Family '''Neobalaenidae''' **** [[Pygmy right whale]], ''Caperea marginata'' ** Suborder '''Odontoceti'