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Cetaceans are any member of the infraorder Cetacea, aquatic mammals which are mostly marine. This infraorder includes two extant parvorders - odontoceti and mysteceti - which share a common ancestor by means of an extinct parvorder, archaeoceti. Cetacea as an infraorder is related most to the hippopotamuses and fall under the order Artiodactyla accordingly, having diverged from even-toed ungulates 53 to 45 million years ago. Members of this infraorder vary in shape and size, from small porpoises to great blue whales. A summary of their taxonomy is listed below.

Taxonomy:

• mammal
• cetacean
• baleen_whale
• fin_whale
• gray_whale
• humpback_whale
• minke_whale
• right_whale
• sei_whale
• bryde's_whale
• bowhead_whale
• blue_whale
• toothed_whale
• beaked_whale
• bottlenose_whale
• well-nosed_dolphin
• physeteroid
• sperm_whale
• delphinoid
• oceanic_dolphin
• striped_dolphin
• pilot_whale
• hourglass_dolphin
• commerson's_dolphin
• bottlenose_dolphin
• dusky_dolphin
• humpback_dolphin
• hector's_dolphin
• atlantic_spotted_dolphin
• orca
• common_dolphin
• short-beaked_common_dolphin
• long-beaked_common_dolphin
• white-sided_dolphin
• pacific_white-sided_dolphin
• atlantic_white-sided_dolphin
• monodontid
• beluga
• narwhal
• river_dolphin
• amazon_river_dolphin
• baiji - Chinese river dolphin
• la_plata_dolphin
• south_asian_river_dolphin
• porpoise
• harbour_porpoise
• archaeoceti
• ambulocetid
• ambulocetus
• protocetid
• maiacetus
• pakicetid
• pakicetus
• basilosaurid
• basilosaurus

Related:

• werecetacean
• wereorca
• cetacean_taur
• orca_taur
• cetacean_humanoid
• orca_humanoid

More information:

https://en.wikipedia.org/wiki/Cetacea

Other rankings

• tag group:species
• mammal
• afrosoricid - Golden mole and tenrec.
• bovid - Buffalo, cattle, yak, etc.
• camelid - Alpaca, camel, llama, etc.
• canid - Dog, fox, wolf, etc.
• caprine - Goat, ibex, sheep, etc.
• cervid - Elk, moose, reindeer, etc.
• cetacean - Dolphin, porpoise, whale, etc.
• equine - Donkey, horse, zebra, etc.
• eulipotyphlan - Hedgehog, mole, shrew, etc.
• euplerid - Fanaloka, fossa, vontsira, etc.
• felid - Cat, lion, tiger, etc.
• giraffid - Giraffe, okapi, etc.
• herpestid - Mongoose
• hyaenid - Hyenas
• lagomorph - Rabbit, hare, pika, etc.
• marsupial - Kangaroo, koala, opossum, etc.
• mephitid - Skunks and stink badgers.
• monotreme - Echidna and platypus
• mustelid - Ferret, otter, weasel, etc.
• pinniped - Sea lion, seal, walrus, etc.
• primate - Ape, lemur, monkey, etc. (excludes human)
• proboscidean - Elephant, mammoth, mastodon, etc.
• procyonid - Kinkajou, raccoon, ring-tailed cat, etc.
• suina - Boar, pig, warthog, etc.
• rodent - Mouse, rat, squirrel, etc.
• ursid - Grizzly bear, panda, polar bear, etc.
• viverrid - Civet, genet, linsang, etc.
• xenarthran - Anteater, armadillo, and sloth.