Английская Википедия:Cetotherium

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Шаблон:Short description Шаблон:Automatic taxobox

Cetotherium ("whale beast") is an extinct genus of baleen whales from the family Cetotheriidae.[1]

Taxonomy

Файл:Cetotherium riabinini skull.jpg
C. riabinini skull

The family Cetotheriidae and the genus Cetotherium (sensu lato) have been used as wastebaskets for all kinds of baleen whales, most notably by Шаблон:Harvnb, Spassky (1954) and Шаблон:Harvnb. Based on more recent phylogenetic studies and revisions of many 19th century genera, much smaller monophyletic Cetotheriidae and Cetotherium sensu stricto is limited to a single or only a few species. For example, Шаблон:Harvnb included only C. rathkii and C. riabinini in the genus and only ten genera in the family.[2]

Cetotheriidae were thought to have gone extinct during the Pliocene until 2012, when it was hypothesized that the pygmy right whale was the sole surviving species of this family.[3]

Formerly assigned to Cetotherium

The following species were originally described as nominal species of Cetotherium but have been either reassigned to other genera or removed from Cetotherium:

  • Cetotherium furlongi Kellogg, 1925,[4] is known from a partial skull from the Burdigalian of the Vaqueros Formation in California, but the holotype is lost.[5]
  • Cetotherium gastaldii Strobel, 1875,[6] known from the early Pliocene-age Sabbie d'Asti Formation of the Piedmont region in Italy, is now the type species of the eschrichtiid genus Eschrichtioides.[7]
  • Cetotherium klinderi Brandt, 1871,[8] is known from an isolated earbone from Miocene sediments in Chişinău, Moldova. Although fragmentary, it is not congeneric with the two species of Cetotherium.[2][9]
  • Cetotherium maicopicum Spasski, 1951,[10] based on a specimen from the late Miocene of the Russian Caucasus, was reassigned to the genus Kurdalagonus from the same region in 2012, although Gol'din and Startsev (2016) have questioned this referral.[11][9]
  • Cetotherium mayeri Brandt, 1871,[8] known from a partial skeleton, has been reassigned to Mithridatocetus.[2][9]

Cetotherium incertum Brandt, 1873, known from a vertebra, and "Ziphius" priscus Eichwald, 1840 are nomina dubia, while Cetotherium pusillum Nordmann, 1860 requires re-assessment.[9]

Evolution

Файл:Cetotherium BW.jpg
Restoration of C. furlongi

Cetotheres came into existence during the Oligocene epoch. The cetotheres have been divided into two sub-groups. One group includes Cetotherium. From evolutionary perspective, these whales share some characteristics of the Balaenopteridae and Eschrichtiidae.[12]

Paleobiology

Fossil records have revealed a predator-prey relationship between large sharks (e.g. O. megalodon) and Cetotheriids. The raptorial toothed whale, Livyatan melvillei, may too have posed a threat to these whales.Шаблон:Cn

See also

Шаблон:Portal

References

Notes

Шаблон:Reflist

Sources

Шаблон:Refbegin

Шаблон:Refend

Шаблон:Mysticeti Genera Шаблон:Taxonbar

Партнерские ресурсы
Криптовалюты
Магазины
Хостинг
Разное

  1. ↑ Шаблон:Harvnb
  2. ↑ 2,0 2,1 2,2 Шаблон:Harvnb
  3. ↑ Шаблон:Cite journal
  4. ↑ R. Kellogg. 1925. Fossil cetotheres from California. Contributions to Palaeontology from the Carnegie Institution of Washington 348(2):35-56
  5. ↑ Шаблон:Cite journal
  6. ↑ Шаблон:Cite journal
  7. ↑ Шаблон:Cite journal
  8. ↑ 8,0 8,1 Brandt, J. F. 1871. Bericht uber den Fortgang meiner Studien uber di Cetaceen, welche das grosse zur Tertiarzeit von Mitteleuropa bis Centralasien hinein ausgedehnte Meeresbechen bevolkerten. Bulletin de l'Académie Impériale de Saint-Pétersbourg 16: 563–566.
  9. ↑ 9,0 9,1 9,2 9,3 Шаблон:Cite journal
  10. ↑ P. I. Spasski. 1951. Ostaki tsetoheriev iz Servernogo Kavkaza (okr. g. Maikopa) Remains of cetotheria from the Northern Caucasus in the neighborhood of Maikop Town. Izvestia Akademii Nauk Azerbaidzhanskoi SSR 2:57-65
  11. ↑ Шаблон:Cite journal
  12. ↑ Шаблон:Harvnb
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