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Morenocetus

From Wikipedia, the free encyclopedia

Extinct genus of whale-like animals

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
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Infraorder:	Cetacea
Family:	Balaenidae
Genus:	†Morenocetus Cabrera 1926
Species
†M. parvusCabrera 1926 (type)

Morenocetus is an extinct genus of primitivebalaenid from the Early Miocene (Burdigalian andColhuehuapian in theSALMA classification)Gaiman Formation ofPatagonia,Argentina.

Description

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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 ofMorenocetus 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

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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 byEwan Fordyce.^[2]

References

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^"Buono M.R., Fernández M.S., Cozzuol M.A., Cuitiño J.I., Fitzgerald E.M.G. (2017) The early Miocene balaenidMorenocetus parvus from Patagonia (Argentina) and the evolution of right whales. PeerJ 5:e4148"(PDF). Archived fromthe original(PDF) on 2022-12-07. Retrieved2018-09-30.
^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