# Miophyseter

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Extinct genus of mammals

Miophyseter Temporal range: lower Miocene (Burdigalian) Scientific classification Kingdom: Animalia Phylum: Chordata Class: Mammalia Infraclass: Placentalia Order: Artiodactyla Infraorder: Cetacea Superfamily: Physeteroidea Genus: †Miophyseter Kimura & Hasegawa, 2022 Species: †M. chitaensis Binomial name †Miophyseter chitaensis Kimura & Hasegawa, 2022

***Miophyseter*** is an [extinct](/source/Extinct) [genus](/source/Genus) of [sperm whale](/source/Sperm_whale) in the superfamily [Physeteroidea](/source/Physeteroidea). It includes only one species, ***M. chitaensis***, that was described in 2022 from the lower [Miocene](/source/Miocene) ([Burdigalian](/source/Burdigalian)) of [Toyohama Formation](https://en.wikipedia.org/w/index.php?title=Toyohama_Formation&action=edit&redlink=1), [Chita District](/source/Chita_District), [Aichi Prefecture](/source/Aichi_Prefecture), Japan. This species is known from the well-preserved [cranium](/source/Cranium) with detached teeth and [ear bones](/source/Ear_bones) ([periotic](/source/Periotic_bone), [tympanic bulla](/source/Tympanic_bulla), and [malleus](/source/Malleus)). *Miophyseter* is part of the Physeteroidea [stem group](/source/Stem_group), but more closely related to the [crown group](/source/Crown_group) than to the [macroraptorial sperm whales](/source/Macroraptorial_sperm_whale) known from middle and late Miocene. *Miophyster* may have had an adaptation to deep diving and / or developed [pterygoid muscles](/source/Pterygoid_muscle_(disambiguation)) for active biting. The researchers made this conclusion judging by the presence of a deep and large notch on the ventral surface of the [palatine bone](/source/Palatine_bone) and [pterygoid](/source/Pterygoid_bone). *Miophyseter* is estimated to have been 4.63 meters (15.2 ft) long.[1]

## References

1. **[^](#cite_ref-1)** Kimura, T.; Hasegawa, Y. (2022). ["A New Physeteroid from the Lower Miocene of Japan"](https://doi.org/10.2517%2FPR200021). *Paleontological Research*. **26** (1): 87–101. [Bibcode](/source/Bibcode_(identifier)):[2022PalRe..26.0021K](https://ui.adsabs.harvard.edu/abs/2022PalRe..26.0021K). [doi](/source/Doi_(identifier)):[10.2517/PR200021](https://doi.org/10.2517%2FPR200021). [S2CID](/source/S2CID_(identifier)) [245478545](https://api.semanticscholar.org/CorpusID:245478545).

v t e Odontocete genera Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Artiodactyla Infraorder: Cetacea Odontoceti Odontoceti †Agorophius †Amphidelphis †Ankylorhiza †Archaeodelphis †Argyrocetus †Ashleycetus †Caolodelphis †Chilcacetus †Enigmatocetus †Eoplatanista †Inticetus †Macrodelphinus †Microcetus †Mirocetus †Neosqualodon †Olympicetus †Papahu †Patriocetus †Phoberodon †Phococetus †Prosqualodon †Romaleodelphis †Sachalinocetus †Simocetus †Sulakocetus †Tangaroasaurus †Xenorophidae Albertocetus Cotylocara Echovenator Inermorostrum Xenorophus †Waipatiidae Awamokoa Ediscetus Nihohae Nihoroa Otekaikea Urkudelphis Waipatia †Squalodontidae Eosqualodon Squalodon †Squaloziphiidae Crisocetus? Squaloziphius Yaquinacetus †Eurhinodelphinidae Ceterhinops Eurhinodelphis Iniopsis Mycteriacetus Phocaenopsis Schizodelphis Vanbreenia Xiphiacetus Ziphiodelphis Crown-Odontoceti see below↓ Crown-Odontoceti Physeteroidea †Acrophyseter †Albicetus †Angelocetus †Brygmophyseter †Eudelphis †Hoplocetus †Livyatan †Miophyseter †Rhaphicetus †Scaldicetus †Zygophyseter Kogiidae †Aprixokogia Kogia †Koristocetus †Nanokogia †Platyscaphokogia †Pliokogia †Praekogia †Scaphokogia †Thalassocetus? Physeteridae †Aulophyseter †Cozzuoliphyseter †Diaphorocetus †Eophyseter †Idiophyseter †Idiorophus †Orycterocetus Physeter †Physeterula †Placoziphius †Thalassocetus? Platanistoidea †Aondelphis †Aureia †Dolgopolis †Ensidelphis †Perditicetus †Eurhinodelphinidae? †Squalodontidae? †Waipatiidae? †Allodelphinidae? Allodelphis Arktocara Goedertius Ninjadelphis Zarhinocetus †Squalodelphinidae? Fordycetus Furcacetus Huaridelphis Macrosqualodelphis Medocinia Miodelphinus Notocetus Phocageneus Squalodelphis Platanistidae †Araeodelphis †Dilophodelphis †Grimadelphis †Pachyacanthus? †Pebanista Platanista †Pomatodelphis †Prepomatodelphis †Zarhachis? Ziphiidae †Aporotus †Beneziphius †Caviziphius †Chavinziphius †Chimuziphius †Choneziphius †Dagonodum †Flandriacetus †Globicetus †Imocetus †Khoikhoicetus †Mamaziphius †Messapicetus †Nazcacetus †Nenga †Ninoziphius †Notoziphius †Pterocetus Tasmacetus †Tusciziphius †Xhosacetus †Ziphirostrum Berardiinae †Archaeoziphius Berardius †Microberardius Ziphiinae †Izikoziphius Ziphius Hyperoodontinae †Africanacetus Hyperoodon †Ihlengesi Indopacetus Mesoplodon Delphinida see below↓ Delphinida Delphinida †Albireo †Atocetus †Brevirostrodelphis †Cammackacetus †Delphinodon †Hadrodelphis †Herbeinodelphis †Liolithax †Lophocetus †Macrokentriodon †Miminiacetus †Odobenocetops †Pictodelphis †Pithanodelphis †Tagicetus †Westmorelandelphis †Kentriodontidae Belonodelphis? Kampholophos Kentriodon Mesokentriodon Platysvercus Sophianacetus Rudicetus Wimahl Lipotidae Eolipotes Lipotes †Parapontoporia †Prolipotes Inioidea †Awadelphis Iniidae †Brujadelphis †Goniodelphis Inia †Ischyrorhynchus †Isoninia? †Isthminia †Kwanzacetus †Meherrinia †Plicodontinia †Saurocetes Pontoporiidae †Atocetus? †Auroracetus †Brachydelphis †Piscorhynchus †Pliopontos †Pontistes †Protophocaena †Samaydelphis †Scaldiporia †Stenasodelphis Pontoporia Delphinoidea Monodontidae †Bohaskaia †Casatia Delphinapterus †Denebola †Haborodelphis Monodon Phocoenidae †Archaeophocaena †Australithax †Brabocetus †Haborophocoena †Lomacetus †Miophocaena Neophocaena †Numataphocoena Phocoena Phocoenoides †Piscolithax †Pterophocaena? †Semirostrum †Septemtriocetus Delphinidae †Arimidelphis †Australodelphis †Eodelphinus †Etruridelphis †Hemisyntrachelus Lagenorhynchus Leucopleurus †Norisdelphis Orcinus †Platalearostrum †Pliodelphis †Pterophocaena? †Septidelphis Lissodelphininae Aethalodelphis Cephalorhynchus Lissodelphis Delphininae Delphinus Lagenodelphis Sotalia Sousa Stenella Tursiops Globicephalinae Feresa Globicephala Grampus Orcaella Peponocephala Pseudorca †Rododelphis Steno

Taxon identifiers Miophyseter Wikidata: Q110412223 GBIF: 11889509

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Adapted from the Wikipedia article [Miophyseter](https://en.wikipedia.org/wiki/Miophyseter) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Miophyseter?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.