Boreameryx, an unusual new artiodactyl (Mammalia) from the Pliocene of Arctic Canada and endemism in Arctic fossil mammals

Boreameryx braskerudi, gen. et sp. nov., from Early Pliocene (about 5–4 Ma) deposits of Ellesmere Island, Nunavut, is represented by the posterior portion of a dentary with three molars, a partial calcaneum, unciform, and fragments of long bones and ribs. The incompletely known structure of Boreameryx must leave open the questions of its relationships within the pecoran ruminants. Even its possible affinities with early cervoids and the North American blastomerycines are speculative. We favour the tentative association of Boreameryx within the Cervoidea. Rather than evolving hypsodonty to deal with abrasive northern foods, Boreameryx apparently retained plesiomorphic dental structures—even augmenting those structures in a unique morphological development. We hypothesize, based on recorded relationships and ranges (both geological and geographical) of several Beaver Pond site mammals, including Boreameryx, that they indicate a significant interval of endemic development in a high northern biotic province p...

[1]  I. Vislobokova.  The importance of Late Miocene faunal exchanges between Eastern Mediterranean areas and Central Europe , 2005 .

[2]  C. Harington,et al.  An Arctic mammal fauna from the Early Pliocene of North America , 2003, Nature.

[3]  E. Douzery,et al.  Molecular and morphological phylogenies of ruminantia and the alternative position of the moschidae. , 2003, Systematic biology.

[4]  S. Elias,et al.  Arctic North American seasonal temperatures from the latest Miocene to the Early Pleistocene, based on mutual climatic range analysis of fossil beetle assemblages , 2002 .

[5]  M. Diamond,et al.  Review of Leptomeryx (Artiodactyla, Leptomeryicidae) from the Orellan (Oligocene) of Nebraska , 2002, Annals of the Carnegie Museum.

[6]  C. Harington,et al.  A peculiar new fossil shrew (Lipotyphla, Soricidae) from the High Arctic of Canada , 2002 .

[7]  T. Mörs,et al.  A new record of the enigmatic Eurasian Miocene ruminant artiodactyl Orygotherium , 2001 .

[8]  L. Marincovich.  Central American paleogeography controlled Pliocene Arctic Ocean molluscan migrations , 2000 .

[9]  C. Harington,et al.  An Early Pliocene Hipparionine Horse from the Canadian Arctic , 1999 .

[10]  C. Janis.  Grades and clades in hornless ruminant evolution: the reality of the Gelocidae and the systematic position of Lophiomeryx and Bachitherium , 1987 .

[11]  M. T. Antunes,et al.  Amphicyon giganteus carnassier geant du Miocene , 1968 .

[12]  George Gaylord Simpson,et al.  Classification of mammals : above the species level , 1997 .

[13]  C. Janis,et al.  Relationships of the Ruminantia (Artiodactyla) and an Analysis of the Characters Used in Ruminant Taxonomy , 1993 .

[14]  J. V. Matthews,et al.  Late Tertiary Plant Macrofossils from Localities in Arctic/Subarctic North America: A Review of the Data , 1990 .

[15]  J. G. Fyles.  High Terrace Sediments, Probably of Neogene Age, West-Central Ellesmere Island, Northwest Territories , 1989 .

[16]  C. Janis,et al.  The interrelationships of higher ruminant families : with special emphasis on the members of the Cervoidea. American Museum novitates ; no. 2893 , 1987 .

[17]  J. Leinders.  Hoplitomerycidae fam. nov. (Ruminantia, Mammalia) from Neogene fissure fillings in Gargano (Italy) Part 1: The cranial osteology of Hoplitomeryx gen. nov. and a discussion on the classification of pecoran families , 1984 .

[18]  S. Webb,et al.  The phylogeny of hornless ruminants and a description of the cranium of Archaeomeryx. Bulletin of the AMNH ; v. 167, article 3 , 1980 .

[19]  C. Frick.  Horned ruminants of North America. Bulletin of the AMNH ; v. 69 , 1937 .

[20]  W. Matthew.  On a new primitive deer and two traguloid genera from the Lower Miocene of Nebraska. American Museum novitates ; no. 215 , 1926 .

[21]  W. Matthew.  Osteology of Blastomeryx ; and phylogeny of the American Cervidae. Bulletin of the AMNH ; v. 24, article 27. , 1908 .