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Sitsqwayk Temporal range: Late Oligocene, 28–26 Ma 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:	Chaeomysticeti
Genus:	†Sitsqwayk Peredo and Uhen, 2016
Type species
Sitsqwayk cornishorum Peredo and Uhen, 2016

Sitsqwayk is a genus of baleen whale from Late Oligocene (Chattian) marine deposits in Washington state. The generic name refers to a powerful water spirit in the folklore of the Klallam that is said to bring wealth.

Description

Sitsqwayk is distinguished from other early chaeomysticetes by the features of the rostrum and skull roof, especially in the premaxillae. It differs from members of Eomysticetidae in that the dorsal edge of the skull ascends steeply towards the palate, and that the longitudinal keel on the palate is sharp and narrow, constituting 75 percent of the rostrum.

Phylogeny

Within Chaeomysticeti, Sitsqwayk is recovered as the most basal chaeomysticete, more primitive than eomysticetids and Horopeta.

Paleobiology

Sitsqwayk is coeval with another Oligocene mysticete from the Pysht Formation, the aetiocetid Fucaia goedertorum.

References

1. ^ Peredo, Carlos Mauricio; Uhen, Mark D. (2016-11-01). "A new basal chaeomysticete (Mammalia: Cetacea) from the Late Oligocene Pysht Formation of Washington, USA". Papers in Palaeontology. 2 (4): 533–554. doi:10.1002/spp2.1051. ISSN 2056-2802.

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

• Oligocene cetaceans
• Extinct animals of North America
• Monotypic prehistoric cetacean genera
• Fossil taxa described in 2016