Cetotheriidae

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Cetotheriidae
The pygmy right whale (Caperea marginata), the only recent species of the Cetotheriidae.

The pygmy right whale ( Caperea marginata ), the only recent species of the Cetotheriidae.

Temporal occurrence
Chattian (Oligocene) to date
28.1 to 0 million years
Locations

worldwide

Systematics
Class : Mammals (mammalia)
Subclass : Higher mammals (Eutheria)
Superordinate : Laurasiatheria
Order : Whales (cetacea)
Subordination : Baleen whales (Mysticeti)
Family : Cetotheriidae
Scientific name
Cetotheriidae
Brandt , 1872

The Cetotheriidae are a family from the suborder of the baleen whales (Mysticeti). The family appeared in the late Oligocene and it was assumed that they disappeared again in the early Pliocene , until recently the smallest of all recent baleen whales, the minke right whale ( Caperea marginata ), which grows only 6 meters long and occurs in the temperate cold seas of the southern hemisphere Member of the Cetotheriidae has been identified.

features

The Cetotheriidae are distinguished from other baleen whales by a combination of the following anatomical features of the skull (list not complete):

The seam between the upper jawbone ( maxillary ) and frontal bone (frontal) is slightly concave and oblique on the rear sides. The rear sections of the snout bones (rostrum) form a V-shaped wedge between the eye sockets. The upper parts of the maxillary bones are in contact with each other or are close together. The intermaxillary bone (premaxillary) narrows backwards, along the nasal bone (nasal) and does not extend to the rear sections of the maxillary. The nasal bone is triangular and wedge-shaped. At its dorsal vertex, the frontal bone is reduced or completely overgrown by rostral bones. The joint socket of the scaly bone (squamosum) is not deeply indented. Like all other baleen whales, the Cetotheriidae are toothless.

A feature that the Cetotheriidae share with the furrowed whales (Balaenopteridae) is the strong interlocking of the rostral bones with the rest of the skull bones and the maxillary.

External system

The Cetotheriidae are the sister group of the furrow whales, both families together, united as superfamily Balaenopteroidea, are in turn the sister group of the right whales (Balaenidae).

  Baleen whales  (Mysticeti)  

 Right whales (Balaenidae)


  Balaenopteroidea  

 Cetotheriidae


   

 Furrow whales (Balaenopteridae)




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Internal system

Currently, two extinct and one recent subfamily are distinguished:

Skull of Piscobalaena nana

swell

  1. ^ A b c R. Ewan Fordyce, Felix G. Marx: The pygmy right whale Caperea marginata: the last of the cetotheres . In: Proceedings of the Royal Society B: Biological Sciences. 280, 2012, p. 20122645, doi : 10.1098 / rspb.2012.2645 .
  2. ↑ Toshiyuki Kimura & Yoshikazu Hasegawa: A New Baleen Whale (Mysticeti: ​​Cetotheriidae) from the Earliest Late Miocene of Japan and a Reconsideration of the Phylogeny of Cetotheres. Journal of Vertebrate Paleontology 30 (2): 577-591. 2010, doi : 10.1080 / 02724631003621912
  3. ↑ Virginie Bouetel, Christian de Muizon (2006): The anatomy and relationships of Piscobalaena nana (Cetacea, Mysticeti), a Cetotheriidae ss from the early Pliocene of Peru. Geodiversitas 28 (2): 319-395. PDF ( Memento of the original from October 30, 2007 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.mnhn.fr
  4. ^ The Paleobiology Database: Cetotheriidae
  5. ^ The Paleobiology Database: Cetotheriinae
  6. ↑ The Paleobiology Database: Herpetocetinae

Web links

Commons : Cetotheriidae  - Collection of images, videos and audio files