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Tiucetus Temporal range: Tortonian ~11–9 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓

Holotype skull in lateral view
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Infraorder:	Cetacea
Family:	Cetotheriidae
Genus:	†Tiucetus Marx, Lambert & De Muizon 2017

Tiucetus is an extinct genus of cetotheriid baleen whale known from the Late Miocene Pisco Formation of Peru.

Description

Tiucetus is distinct from other cetotheriids in having a squamosal cleft; from eomysticetids in having comparatively short nasals, a more anteriorly projected supraoccipital and parietal, and a tympanic bulla that is rotated so that the inner posterior prominence faces dorsally.^[1]

Classification

Tiucetus falls basally in Cetotheriidae, less derived than Joumocetus and Cephalotropis.

Palaeogeography

Other marine mammals found in the Pisco Formation include another cetotheriid, Piscobalaena, the odd dolphin Odobenocetops, the killer sperm whale Acrophyseter, the long-necked seal Acrophoca, and aquatic sloth Thalassocnus.

References

^ Marx, F., Lambert, O., de Muizon, C. 2017. A new Miocene baleen whale from Peru deciphers the dawn of cetotheriids. Royal Society Open Science. doi: 10.1098/rsos.170560

Extant Cetacea species

Kingdom Animalia
Phylum Chordata
Class Mammalia
Infraclass Eutheria
Superorder Laurasiatheria
Order Artiodactyla
Suborder Whippomorpha

Parvorder Mysticeti (Baleen whales)

Balaenidae

Balaena	Bowhead whale (B. mysticetus)
Eubalaena (Right whales)	Southern right whale (E. australis) North Atlantic right whale (E. glacialis) North Pacific right whale (E. japonica)

Balaenopteridae
(Rorquals)

Balaenoptera	Common minke whale (B. acutorostrata) Antarctic minke whale (B. bonaerensis) Sei whale (B. borealis) Bryde's whale (B. brydei) Pygmy Bryde's whale (B. edeni) Blue whale (B. musculus) Omura's whale (B. omurai) Fin whale (B. physalus) Rice's whale (B. ricei)
Eschrichtius	Gray whale (E. robustus)
Megaptera	Humpback whale (M. novaeangliae)

Cetotheriidae

Caperea	Pygmy right whale (C. marginata)

Parvorder Odontoceti (Toothed whales)

Delphinidae
(Oceanic dolphins)

Cephalorhynchus	Commerson's dolphin (C. commersonii) Chilean dolphin (C. eutropia) Heaviside's dolphin (C. heavisidii) Hector's dolphin (C. hectori)
Delphinus	Common dolphin (D. delphis)
Feresa	Pygmy killer whale (F. attenuata)
Globicephala (Pilot whales)	Short-finned pilot whale (G. macrorhynchus) Long-finned pilot whale (G. melas)
Grampus	Risso's dolphin (G. griseus)
Lagenodelphis	Fraser's dolphin (L. hosei)
Lagenorhynchus	White-beaked dolphin (L. albirostris) Atlantic white-sided dolphin (L. acutus) Peale's dolphin (L. australis) Hourglass dolphin (L. cruciger) Pacific white-sided dolphin (L. obliquidens) Dusky dolphin (L. obscurus)
Lissodelphis (Right whale dolphins)	Northern right whale dolphin (L. borealis) Southern right whale dolphin (L. peronii)
Orcaella	Irrawaddy dolphin (O. brevirostris) Australian snubfin dolphin (O. heinsohni)
Orcinus	Orca or killer whale (O. orca)
Peponocephala	Melon-headed whale (P. electra)
Pseudorca	False killer whale (P. crassidens)
Sotalia	Tucuxi (S. fluviatilis) Guiana dolphin (S. guianensis)
Sousa (Humpback dolphins)	Indo-Pacific humpback dolphin (S. chinensis) Indian Ocean humpback dolphin (S. plumbea) Australian humpback dolphin (S. sahulensis) Atlantic humpback dolphin (S. teuszii)
Stenella	Pantropical spotted dolphin (S. attenuata) Clymene dolphin (S. clymene) Striped dolphin (S. coeruleoalba) Atlantic spotted dolphin (S. frontalis) Spinner dolphin (S. longirostris)
Steno	Rough-toothed dolphin (S. bredanensis)
Tursiops (Bottlenose dolphins)	Indo-Pacific bottlenose dolphin (T. aduncus) Burrunan dolphin (T. australis) Tamanend's bottlenose dolphin (T. erebennus) Common bottlenose dolphin (T. truncatus)

Monodontidae

Delphinapterus	Beluga whale (D. leucas)
Monodon	Narwhal (M. monoceros)

Phocoenidae
(Porpoises)

Neophocoena (Finless porpoises)	Indo-Pacific finless porpoise (N. phocaenoides) Yangtze finless porpoise (N. asiaeorientalis) East Asian finless porpoise (N. sunameri)
Phocoena	Spectacled porpoise (P. dioptrica) Harbour porpoise (P. phocoena) Vaquita (P. sinus) Burmeister's porpoise (P. spinipinnis)
Phocoenoides	Dall's porpoise (P. dalli)

Physeteridae

Physeter	Sperm whale (P. macrocephalus)

Kogiidae

Kogia	Pygmy sperm whale (K. breviceps) Dwarf sperm whale (K. simus)

Iniidae

Inia	Araguaian river dolphin (I. araguaiaensis) Bolivian river dolphin (I. boliviensis) Amazon river dolphin (I. geoffrensis)

Lipotidae

Lipotes	Baiji (L. vexillifer)

Platanistidae

Platanista	Ganges river dolphin (P. gangetica) Indus river dolphin (P. minor)

Pontoporiidae

Pontoporia	La Plata dolphin (P. blainvillei)

Ziphiidae
(Beaked whales)

Berardius	Arnoux's beaked whale (B. arnuxii) Baird's beaked whale (B. bairdii) Sato's beaked whale (B. minimus)
Hyperoodon (Bottlenose whales)	Northern bottlenose whale (H. ampullatus) Southern bottlenose whale (H. planifrons)
Indopacetus	Tropical bottlenose whale (I. pacificus)
Mesoplodon (Mesoplodont whales)	Sowerby's beaked whale (M. bidens) Andrews' beaked whale (M. bowdoini) Hubbs' beaked whale (M. carlhubbsi) Blainville's beaked whale (M. densirostris) Ramari's beaked whale (M. eueu) Gervais's beaked whale (M. europaeus) Ginkgo-toothed beaked whale (M. ginkgodens) Gray's beaked whale (M. grayi) Hector's beaked whale (M. hectori) Deraniyagala's beaked whale (M. hotaula) Strap-toothed whale (M. layardii) True's beaked whale (M. mirus) Perrin's beaked whale (M. perrini) Pygmy beaked whale (M. peruvianus) Stejneger's beaked whale (M. stejnegeri) Spade-toothed whale (M. traversii)
Tasmacetus	Shepherd's beaked whale (T. shepherdi)
Ziphius	Cuvier's beaked whale (Z. cavirostris)

Genera of baleen whales and their extinct allies

Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea

Mysticeti

†Borealodon
†Coronodon
†Imerocetus
†Mioceta?
†Piscocetus
†Siphonocetus?
†Tretulias?
†Ulias?

†Aetiocetidae

†Llanocetidae

Llanocetus
Mystacodon

†Mammalodontidae

Janjucetus
Mammalodon

Chaeomysticeti

†Eomysticetoidea

Cetotheriopsis

†Hibacetus
†Isanacetus
†Isocetus
†Mauicetus
†Pinocetus
†Taikicetus
†Tiphyocetus
†Uranocetus

†Aglaocetidae

Aglaocetus

†Diorocetidae

†Pelocetidae

†Tranatocetidae

Cetotheriidae

†Cephalotropis †Journocetus †Otradnocetus †Palaeobalaena? †Titanocetus? †Tiucetus
†Cetotheriinae	Brandtocetus Cetotherium Ciuciulea Eucetotherium Kurdalagonus Mithridatocetus Vampalus Zygiocetus
Herpetocetinae	Caperea †Herentalia †Herpetocetus †Metopocetus †Miocaperea †Nannocetus †Piscobalaena

Balaenopteroidea

†Eobalaenoptera
Balaenopteridae	†Archaebalaenoptera †Archaeschrichtius Balaenoptera †Burtinopsis? †Cetoteriophanes †Diunatans †Eschrichtioides Eschrichtius †Gricetoides †Incakujira Megaptera †Megapteropsis? †Miobalaenoptera †Nehalaennia †Notiocetus †Parabalaenoptera †Plesiobalaenoptera †Plesiocetus †Praemegaptera †Protororqualus

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