Leakeymys

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Leakeymys
Temporal occurrence
middle Miocene ( Serravallian )
13.65 to 11.61 million years
Locations
Systematics
Euarchontoglires
Rodents (Rodentia)
Mouse relatives (Myomorpha)
Mice-like (Muroidea)
incertae sedis
Leakeymys
Scientific name
Leakeymys
Lavocat , 1964
Art
  • Leakeymys ternani Lavocat, 1964
Fort Ternan (Kenya)
Fort Ternan
Fort Ternan
Locality of Leakeymys ternani in Kenya

Leakeymys is an extinct genus of mice knownfrom the Middle Miocene of East Africa . Within this their position is uncertain and a relationship with the gerbils or with the hamster rats has been suggested. Named after Louis Leakey , Leakeymys was described by René Lavocat in1964.

denture

The lower molars of Leakeymys are typically lophodont with no longitudinal connections between the individual tooth strips. Additionally there are side humps of the murid type . The anteroconid is shaped like a strip and without traces of a horseshoe pattern. The third lower molar has two ridges.

Apart from the third lower molar, the general crown pattern resembles that of the more advanced taterillins .

nomenclature

Louis Leakey left three jaws to René Lavocat from Fort Ternan in western Kenya . Lavocat described this on June 13, 1964 as a new genus and new species Leakeymys ternani and temporarily assigned a further skull fragment with heavily worn teeth. The generic name Leakeymys is derived from Louis Leakey and from ancient Greek mys ' mouse ', the specific epithet ternani from the place where it was found.

Systematics

Lavocat (1964) considers a relationship between Leakeymys and the gerbils, especially the bare-sole gerbils , possible. This is followed by Daxner-Höck (1972) and Kowalski (1974). Daxner-Höck considers a separate development of the Eurasian Pseudomeriones and the European Epimeriones to be certain. According to Pawlinow (2008), the third lower molar does not match the development leading to the further developed lophodont taterillins , as these have a much simpler third lower molar.

According to Pawlinow (1984) and Tong and Jaeger (1993), Leakeymys is probably not a gerbil, but could be more closely related to the hamster rats. This is indicated by the two ridges of the third lower molar and the secondary humps of the murid type, combined with the highly developed lophodontia.

McKenna and Bell (1997) state the position of Leakeymys within the mouse species as uncertain .

Web links

Additional and used web links:

literature

Used literature:

  • Gudrun Daxner-Höck: The vertebrate fauna from the Old Pliocene (Pont) from Eichkogel near Mödling (Lower Austria): IV. Gerbillinae (Rodentia, Mammalia) . In: Annales of the Natural History Museum in Vienna . tape 76 , 1972, p. 143–160 ( full text [PDF; 3.4 MB ]).
  • Malcolm C. McKenna, Susan K. Bell: Classification of Mammals Above the Species Level . Columbia University Press, New York 1997, ISBN 0-231-11012-X (631 pages).
  • Igor Jakowlewitsch Pawlinow: A review of phylogeny and classification of Gerbillinae (Mammalia: Rodentia) . In: Soologicheskie issledovanija . No. 9 , 2008, ISSN  1025-532X , p. 1-68 .

Literature used indirectly:

  • Kazimierz Kowalski: Remains of Gerbillinae (Rodentia, Mammalia) from the Pliocene of Poland . In: Bulletin of the Polish Academy of Sciences. Biology . tape 22 , no. 9 , 1974, ISSN  0001-4087 , pp. 595-598 .
  • René Lavocat: Fossil rodents from Fort Ternan, Kenya . In: Nature . tape 202 , 1964, ISSN  0028-0836 , pp. 1131 , doi : 10.1038 / 2021131a0 .
  • Igor Jakowlewitsch Pawlinow: [Evolution of the dental crown pattern in Gerbillidae] . In: Archive of the Zoological Museum of Moscow State University . tape 22 , 1984, pp. 93–134 (Russian, with English summary).
  • Haiyan Tong, Jean-Jacques Jaeger: Muroid rodents from the Middle Miocene Fort Ternan Locality (Kenya) and their contribution to the phylogeny of muroids . In: Palaeontographica. A department . tape 229 , 1993, ISSN  0375-0442 , pp. 51-73 .

Individual evidence

  1. ↑ a b The Paleobiology Database. Retrieved January 3, 2020 .
  2. ↑ a b c Daxner-Höck, 1972 (p. 157).
  3. ↑ a b Pawlinow, 2008 (p. 23).
  4. ↑ a b Pawlinow, 2008 (p. 12).
  5. ↑ R. LAVOCAT: Fossil Rodents from Fort Ternan, Kenya. In: Nature. 202, 1964, pp. 1131-1131, doi: 10.1038 / 2021131a0 .
  6. ↑ Lavocat, 1964. → Quoted in: Daxner-Höck, 1972 (p. 157); Pavlinow, 2008 (p. 23).
  7. ↑ Kowalski, 1974. → Quoted in: Pawlinow, 2008 (p. 23).
  8. ^ Pawlinow, 1984. → Quoted in: Pawlinow, 2008 (p. 23).
  9. ^ Tong and Jaeger, 1993. → Quoted in: Pawlinow, 2008 (p. 23).
  10. ^ McKenna and Bell, 1997 (p. 136).