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Isocetus Temporal range: Langhian–Serravallian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Infraorder:	Cetacea
Parvorder:	Mysticeti
Clade:	†Thalassotherii
Genus:	†Isocetus van Beneden, 1880
Species
I. depauwi van Beneden, 1880 (type)

Isocetus is an extinct genus of baleen whale belonging to the clade Thalassotherii. Remains have been found in middle Miocene marine deposits in Belgium.

Description

Isocetus was considered a nomen dubium by Steeman (2010) but was treated as a distinct species by Bisconti et al. (2013) based on characters of the mandibular condyle and dentary. A complete thalassothere specimen from Belgium previously assigned to Isocetus depauwi by Abel (1938) is now the holotype of the species Parietobalaena campiniana.

References

1. O. Abel. 1938. Vorlaeufige mitteilungen ueber die revision der fossilen mystacoceten aus dem Tertiaer Belgiens. Bulletin du Musee royal d'Histoire naturelle de Belgique 14(1):1-34
2. M. Steeman. 2010. The extinct baleen whale fauna from the Miocene-Pliocene of Belgium and the diagnostic cetacean ear bones. Journal of Systematic Palaeontology 8(1):63-80
3. M. Bisconti, O. Lambert, and M. Bosselaers. 2013. Taxonomic revision of Isocetus depauwi (Mammalia, Cetacea, Mysticeti) and the phylogenetic relationships of archaic 'cetothere' mysticetes. Palaeontology 56(1):95-127

v t e Genera of baleen whales and their extinct allies
Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Artiodactyla Infraorder: Cetacea
Mysticeti Mysticeti †Borealodon †Coronodon †Imerocetus †Mioceta? †Piscocetus †Siphonocetus? †Tretulias? †Ulias? †Aetiocetidae Aetiocetus Ashorocetus Chonecetus Fucaia Morawanocetus Willungacetus †Llanocetidae Llanocetus Mystacodon †Mammalodontidae Janjucetus Mammalodon Chaeomysticeti Horopeta Sitsqwayk Whakakai †Eomysticetoidea Cetotheriopsis †Eomysticetidae Eomysticetus Micromysticetus Tohoraata Tokarahia Waharoa Yamatocetus Balaenomorpha Balaenidae †Antwerpibalaena †Archaeobalaena Balaena †Balaenella †Balaenula †Balaenotus Eubalaena †Idiocetus †Mesoteras †Morenocetus †Peripolocetus †Protobalaena Thalassotherii †Hibacetus †Isanacetus †Isocetus †Mauicetus †Pinocetus †Taikicetus †Tiphyocetus †Uranocetus †Aglaocetidae Aglaocetus †Diorocetidae Amphicetus Diorocetus Plesiocetopsis Thinocetus †Pelocetidae Cophocetus Halicetus Parietobalaena Pelocetus †Tranatocetidae Mesocetus Mixocetus Tranatocetus 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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