Morenocetus

Morenocetus Temporal range: Early Miocene (Colhuehuapian) ~20–16 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓

Holotype cranium
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Infraorder:	Cetacea
Family:	Balaenidae
Genus:	†Morenocetus Cabrera 1926
Species
†M. parvus Cabrera 1926 (type)

Morenocetus is an extinct genus of primitive balaenid from the Early Miocene (Burdigalian and Colhuehuapian in the SALMA classification) Gaiman Formation of Patagonia, Argentina.

Description

Morenocetus is distinguished from more derived balaenids in the narrow exposure of the squamosal lateral to the exoccipital, a short supraorbital process of the frontal, straight lateral edges of the supraoccipital, and a postorbital process of the frontal oriented posteriorly. It can be distinguished from the only other Miocene balaenid, Peripolocetus in having a dorsoventrally expanded zygomatic process of the squamosal. The body length of Morenocetus is estimated at 5.2–5.6 metres (17–18 ft), and the rostrum is moderately arched dorsoventrally in contrast to crown Balaenidae.^[1]

Classification

Morenocetus is the oldest named extinct balaenid so far, although a chaeomysticete specimen from late Oligocene marine deposits in New Zealand was reported as a stem-balaenid in an SVP 2002 abstract by Ewan Fordyce.^[2]

References

^ "Buono M.R., Fernández M.S., Cozzuol M.A., Cuitiño J.I., Fitzgerald E.M.G. (2017) The early Miocene balaenid Morenocetus parvus from Patagonia (Argentina) and the evolution of right whales. PeerJ 5:e4148" (PDF). Archived from the original (PDF) on 2022-12-07. Retrieved 2018-09-30.
^ Fordyce, R.E., 2002. Oligocene origin of skim–feeding right whales: a small archaic balaenid from New Zealand. Journal of Vertebrate Paleontology 22:54A

†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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This page was last edited on 6 December 2023, at 18:01

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Description

Classification

References

Further reading