Skip to content. | Skip to navigation

Personal tools

 

 

 

 
     

 

 

 

 

 

 

 

 

 

 

 

 

You are here: Home / PDFs on demand / Bibliographical References of PDFs on demand / Postcranial Analysis of a Carnivoran-Like Archaic Ungulate: The Case of Arctocyon primaevus (Arctocyonidae, Mammalia) from the Late Paleocene of France

Christine Argot (2013)

Postcranial Analysis of a Carnivoran-Like Archaic Ungulate: The Case of Arctocyon primaevus (Arctocyonidae, Mammalia) from the Late Paleocene of France

Journal of Mammalian Evolution, 20(2):83-114.

The postcranial skeleton of the late Paleocene Arctocyon primaevus is described based on a sub-complete associated specimen. A comparison with arboreal or scansorial and fossorial extant taxa shows that on the forelimb, several features suggest arboreal capabilities, including the development of abductors and adductors, the development of digital flexors, which allows grasping/manipulative ability, as well as the highly mobile articulations, the convex ulna, and the pentadactyl, plantigrade foot. In contrast with the highly mobile joints of the limbs, Arctocyon had a rigid posterior thoracic area, characterized by revolute zygapophyses unknown in extant mammals. The morphology of the most anterior caudal vertebra indicates that the tail was long, powerful, muscular, and rigid at its base, and that it played an important role in locomotion. The morphology of the hind limb is congruent with that of the forelimb, the development of the adductors, flexors, and rotators of the mobile hip joint being emphasized. Although the femoral trochlea is longer and better defined than in highly arboreal taxa, Arctocyon probably moved in a controlled fashion. A comparison with South American borhyaenoids shows that Arctocyon is morphologically more similar to some predator-like Miocene metatherians than to any living mammal. It represents an interesting mix between Prothylacinus and Borhyaena in overall size and proportions, and shows a development of crests and processes of the humerus similar to those of Prothylacinus. Arctocyonidae, which evolved towards incipient saber-toothed canines combined with cheek teeth compatible with an omnivorous diet, and which show a postcranium that is morphologically more similar to carnivorans than to ungulates, represent a mosaic of features that is of particular interest in the evolution of mammals.

metatheria, functional-adaptive analysis, adaptations, Carnivora, paleobiology, Arctocyonidae, extant marsupials, pucadelphys-andinus, eocene, anatomy, marsupials mayulestes-ferox, Functional morphology, Borhyaenoids, Postcranium, Paleocene, skeleton
WOS:000318627100001
Year

1875 1876 1877 1878 1879
1880 1881 1882 1883 1884
1885 1886 1887 1888 1889
1890 1891 1892 1893 1894
1895 1896 1897 1898 1899

1900 1901 1902 1903 1904
1905 1906 1907 1908 1909
1910 1911 1912 1913 1914
1915 1916 1917 1918 1919
1920 1921 1922 1923 1924

1925 1926 1927 1928 1929
1930 1931 1932 1933 1934
1935 1936 1937 1938 1939
1940 1941 1942 1943 1944
1945 1946 1947 1948 1949

1950 1951 1952 1953 1954
1955 1956 1957 1958 1959
1960 1961 1962 1963 1964
1965 1966 1967 1968 1969
1970 1971 1972 1973 1974

1975 1976 1977 1978 1979
1980 1981 1982 1983 1984
1985 1986 1987 1988 1989
1990 1991 1992 1993 1994
1995 1996 1997 1998 1999

2000 2001 2002 2003 2004
2005 2006 2007 2008 2009
2010 2011 2012 2013 2014
2015 2016 2017 2018 2019
2020 2021 2022 2023 2024

 
e-ressources

 

PDFs on demand
 

 

 

RBINS private PDFs