Pantolestidae

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Pantolestidae
Temporal range: 62.4–30.0  Ma
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O
S
D
C
P
T
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K
Pg
N
early Paleocene to middle Oligocene
Palaeosinopa NT.jpg
reconstruction of Palaeosinopa didelphoides
Paleotomus senior.jpg
part of lower jaw of Paleotomus senior
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Mirorder: Ferae
Order:† Pantolesta
Family:† Pantolestidae
Cope, 1884 [1]
Type genus
† Pantolestes
Cope, 1872
Genera
[see classification]
Synonyms
  • Pantolestida (Haeckel, 1895) [2]
  • Pantolestoidea (Cope, 1887)

Pantolestidae ("all robbers") is an extinct paraphyletic family of placental mammals from extinct order Pantolesta, that lived in North America, Asia and Europe from the early Paleocene to middle Oligocene. [3] [4] [5] [6] [7] They first appear in North America, whence they spread to Europe and Asia. [8]

Contents

Description

The pantolestids were fish predators with a body length of about 50 centimetres (20 in) and a tail about 35 centimetres (14 in) long. The anatomy of these archaic "insectivorous" mammals is best known through well-preserved Middle Eocene Buxolestes specimens found at Messel in Germany and a few other less complete specimens, [9] such as the Palaeosinopa found at Fossil Butte in Wyoming, estimated to have reached body weights of up to 1,400 grams (3 lb), making them relatively large early mammals. [8]

They had moderately strong canines and multi-cusped cutting teeth supported by the strong jaw muscles [9] to which cranial cavities were adapted. This combination of dentition and muscles has been interpreted as an early adaptation to a hard diet such as clams and snails. [8]

Freely articulated forearm bones (radius and ulna) permitted their powerful forelimbs wide rotational movements, while their digits had large bony claws —indicating they could dig and build underground dens. Their powerful hind limbs could not be rotated in the same way, but the prominent transverse processes of the first tail vertebra suggest that they used their powerful tails to propel through the water like modern otters. [9] In later pantolestids there is a prominent cranial crest combined with strong spinal processes, indicating the presence of strong neck muscles needed by swimmers that constantly hold their heads above the water surface. [8]

The youngest pantolestids known are Gobiopithecus khan and Kiinkerishella zaisanica from the Ergilian deposits of Khoer Dzan, Mongolia. These late Asian forms are thought to be one of the few examples of European mammals dispersing into Asia during the Grande Coupure. [10]

Classification

Taxonomy

  • Family: †Pantolestidae(paraphyletic family)(Cope, 1884)
    • Genus: † Aatotomus (Rankin, 2014)
      • †Aatotomus placochton(Rankin, 2014)
    • Genus: † Amaramnis (Gazin, 1962)
      • †Amaramnis gregoryi(Gazin, 1962)
    • Genus: † Chadronia (Cook, 1954)
      • †Chadronia margaretae(Cook, 1954)
      • †Chadronia sp. (BADL 16917) (Boyd, 2014)
    • Genus: † Entomodon (Marsh, 1872)
      • †Entomodon comptus(Marsh, 1872)
    • Genus: † Paleotomus (Van Valen, 1967)
      • †Paleotomus carbonensis(Secord, 1998)
      • †Paleotomus junior(Scott, 2002)
      • †Paleotomus milleri(Rigby, 1980)
      • †Paleotomus radagasti(Van Valen, 1978)
      • †Paleotomus senior(Simpson, 1937)
    • Subfamily: †Dyspterninae(Kretzoi, 1943)
      • Genus: † Cryptopithecus (Schlosser, 1890)
        • †Cryptopithecus alcimonensis(Heissig, 1977)
        • †Cryptopithecus major(Lydekker, 1887)
        • †Cryptopithecus sideroolithicus(Schlosser, 1890)
      • Genus: † Dyspterna (Hopwood, 1927)
        • †Dyspterna woodi(Hopwood, 1927)
      • Genus: † Euhookeria (Russell & Godinot, 1988)
        • †Euhookeria hopwoodi(Cray, 1973)
      • Genus: † Gobiopithecus (Dashzeveg & Russell, 1992)
        • †Gobiopithecus khan(Dashzeveg & Russell, 1992)
      • Genus: † Kiinkerishella (Gabunia & Biryukov 1978)
        • †Kiinkerishella zaisanica(Gabunia & Biryukov 1978)
      • Genus: † Kochictis (Kretzoi, 1943)
        • †Kochictis centennii(Kretzoi, 1943)
      • Genus: † Oboia (Gabunia, 1989)
        • †Oboia argillaceous(Gabunia, 1989)
    • Subfamily: †Pantolestinae(Cope, 1884)
      • Genus: † Bessoecetor (Simpson, 1936)
        • †Bessoecetor krausei(Rankin, 2014)
        • †Bessoecetor pilodontus(Secord, 2008)
        • †Bessoecetor septentrionalis(Russell, 1929)
        • †Bessoecetor thomsoni(Simpson, 1936)
      • Genus: † Bogdia (Dashzeveg & Russell, 1985)
        • †Bogdia orientalis(Dashzeveg & Russell, 1985)
      • Genus: † Bouffinomus (Mathis, 1989)
        • †Bouffinomus lamaudi(Mathis, 1989)
      • Genus: † Buxolestes (Jaegar, 1970)
        • †Buxolestes hammeli(Jaegar, 1970)
        • †Buxolestes minor(Pfretzschner, 1999)
        • †Buxolestes piscator(Koenigswald, 1980)
      • Genus: † Galethylax (Gervais, 1850)
        • †Galethylax brainville(Gervais, 1850)
      • Genus: † Leptonysson (Van Valen, 1967)
        • †Leptonysson basiliscus(Van Valen, 1967)
        • †Leptonysson orthius(Secord, 2008)
      • Genus: † Pagonomus (Russell, 1964)
        • †Pagonomus dionysi(Russell, 1964)
      • Genus: † Palaeosinopa (Matthew, 1901)
      • Genus: † Pantolestes (Cope, 1872)
        • †Pantolestes longieundus(Cope, 1872)
        • †Pantolestes natans(Matthew, 1909)
        • †Pantolestes sabatieri(Smith, 2001)
      • Genus: † Premontrelestes (Smith, 2001)
        • †Premontrelestes duchaussoisi(Smith, 2001)
      • Genus: † Thelysia (Gingerich, 1982)
        • †Thelysia artemia(Gingerich, 1982)
      • Genus: † Zhigdenia (Lopatin, 2006)
        • †Zhigdenia nemegetica(Lopatin, 2006)

References

  1. ↑ Cope, E. D. (1884). The Vertebrata of the Tertiary Formations of the West. Washington, D. C.: U.S. Government Printing Office. doi:10.3133/70038954.
  2. ↑ Haeckel, Ernst (1895). Systematische Phylogenie: Wirbelthiere (in German). Vol. T.3. Berlin: G. Reimer.
  3. ↑ L. Van Valen (1967). "New Paleocene insectivores and insectivore classification". Bulletin of the American Museum of Natural History. 135 (5): 217–284.
  4. ↑ Carroll, Robert L. (1988). Vertebrate Paleontology and Evolution (PDF). New York: W. H. Freeman and Company. pp. 1–698. ISBN   978-0-7167-1822-2.
  5. ↑ McKenna, Malcolm C.; Bell, Susan K. (1997). Classification of Mammals Above the Species Level. New York: Columbia University Press. ISBN   978-0-231-11012-9 . Retrieved 16 March 2015.
  6. ↑ A. V. Lopatin (2006). "Early Paleogene insectivore mammals of Asia and establishment of the major groups of Insectivora". Paleontological Journal. 40 (3): S205 –S405.
  7. ↑ Haaramo, Mikko (March 2008). "†Pantolestidae". Mikko's Phylogeny Archive. Retrieved 17 January 2010.
  8. 1 2 3 4 Jehle, Martin (December 8, 2005). "Insectivore-like mammals: Tiny teeth and their enigmatic owners". Paleocene Mammals. Retrieved 17 January 2010.
  9. 1 2 3 Agustí, Jordi; Antón, Mauricio (2002). Mammoths, Sabertooths, and Hominids: 65 Million Years of Mammalian Evolution in Europe . New York: Columbia University Press. ISBN   0-231-11640-3.
  10. ↑ Spencer G. Lucas, Kate E. Zeigler, Peter E. Kondrashov, Paleogene Mammals: Bulletin 26, 2004
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