| 词条 | Borophagus orc |
| 释义 |
|name = Borophagus orc[1] | fossil_range = Late Miocene to Early Pliocene {{fossilrange|10.3|4.9}} | image = | image_caption = | genus = Borophagus | species = orc | authority = Webb, 1969 | synonyms = }}Borophagus orc is an extinct species of the genus Borophagus of the subfamily Borophaginae, a group of canids endemic to North America from the 10.3 Mya to 4.9 Mya. Borophagus orc existed for approximately {{Mya|10.3-4.9|million years}}.[2] OverviewBorophagus, like other Borophaginae, are loosely known as "bone-crushing" or "hyena-like" dogs. Though not the most massive borophagine by size or weight, it had a more highly evolved capacity to crunch bone than earlier, larger genera such as Epicyon, which seems to be an evolutionary trend of the group (Turner, 2004). During the Pliocene epoch, Borophagus began being displaced by Canis genera such as Canis edwardii and later by Canis dirus. Early species of Borophagus were placed in the genus Osteoborus until recently, but the genera are now considered synonyms.[1] Borophagus orc possibly led a hyena-like lifestyle scavenging carcasses of recently dead animals.{{citation needed|date=February 2016}} TaxonomyTypical features of this genus are a bulging forehead and powerful jaws; it was probably a scavenger.[3] Its crushing premolar teeth and strong jaw muscles would have been used to crack open bone, much like the hyena of the Old World. The adult animal is estimated to have been about {{convert|80|cm}} in length, similar to a coyote, although it was much more powerfully built.[4] MorphologyTwo fossil specimens of Borophagus orc were measured by Legendre and Roth in 1988. They estimated that specimen one weighed {{convert|24.3|kg}} and the second weighed {{convert|22|kg}}.[5] RecombinationBorophagus orc was recombined by X. Wang in 1999.{{clarify|date=February 2016}} Fossil distributionSpecimens were found at only two sites. Near Withlacoochee River, Florida and coastal North Carolina. References1. ^1 {{cite journal|last=Wang |first=Xiaoming |author2=Richard Tedford |author3=Beryl Taylor |title=Phylogenetic systematics of the Borophaginae |journal=Bulletin of the American Museum of Natural History |volume=243 |date=1999-11-17 |url=http://www.nhm.org/expeditions/rrc/wang/documents/Wangetal1999borophaginemonographpart1.pdf |accessdate=2007-07-08 |deadurl=yes |archiveurl=https://web.archive.org/web/20070320023028/http://www.nhm.org/expeditions/rrc/wang/documents/Wangetal1999borophaginemonographpart1.pdf |archivedate=2007-03-20 |df= }} 2. ^PaleoBiology Database: Borophagus orc, basic info 3. ^{{cite book |last=Lambert|first=David|year=1985 |title= The Field Guide to Prehistoric Life|publisher= Facts on File|location=New York|isbn= 0-8160-1125-7|page= 163}} 4. ^{{cite book |editor=Palmer, D.|year=1999 |title= The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals|publisher= Marshall Editions|location=London|isbn= 1-84028-152-9|page= 220}} 5. ^S. Legendre and C. Roth. 1988. Correlation of carnassial tooth size and body weight in recent carnivores (Mammalia). Historical Biology: p. 85-98
Further reading
4 : Borophagines|Miocene canids|Pliocene carnivorans|Prehistoric mammals of North America |
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