Systematics and paleobiology of the Entelodontidae (Mammalia, Artiodactyla)
- 出版日期：2002.
- 页数：222 p. :
- 第一责任说明：Scott E. Foss.
- 分类号：a565
- ISBN：0493492852(ebk.) :
MARC全文
02h0020121 20140425102338.0 cr un||||||||| 100917s2002 xx ||||f|||d||||||||eng | AAI3035713 0493492852(ebk.) : CNY371.35 NGL NGL NGL a565 Foss, Scott E. Systematics and paleobiology of the Entelodontidae (Mammalia, Artiodactyla) [electronic resource] / Scott E. Foss. 2002. 222 p. : digital, PDF file. Source: Dissertation Abstracts International, Volume: 62-12, Section: B, page: 5615. ; Director: J. Michael Parrish. Thesis (Ph.D.) -- Northern Illinois University, 2002. The Entelodontidae is a family of extinct bunodont artiodactyls that are well known for the unusual derivations to their skull and mandible. The results of this study confirm that all members of the Entelodontidae possess a 3-1-4-3/3-1-4-3 tooth formula with a lobed cristid obliqua and precingulum ectoflexus on M2/. The largest upper premolar is P3/, and M3/ has a derived hypoconulid. The skull presents a postorbital bar, a vertical flange on the superior margin of the temporal bone, and a pendulous flange derived from the inferior margin of the jugal (zygomatic) bone. The mandible contains at least one pair of tubercles on the inferior margin of the ramus and the toothrow is similar in height to the position of the temporal-mandibular joint. The bones of the manus and pes are unfused. The results of taxonomic analysis provisionally support 37 of 56 named species in 7 of 23 named, and as yet one unnamed, genera. Previous errors in taxonomic nomenclature and published misidentifications are highlighted for clarification. Multiple revisions are discussed at both generic and specific levels although none are formally presented.;Phylogenetic analysis of 53 characters on 8 clades of entelodonts resulted in a single most parsimonious tree at 64 steps. The species Archaeotherium coarctatum is supported as a clade that is distinct from all other genera of entelodonts, including Archaeotherium. The jugal flanges and mandibular tubercles are most likely derivations that offered the attachment of jaw musculature, which provided stability during wide gape and while crushing hard objects. Because the flanges display both intraspecific and ontogenetic variability, caution should be exercised when using them in systematic descriptions of entelodont groups.;Entelodonts were a water-dependent species that are found in association with large perissodactyls such as brontotheres, rhinos, and chalicotheres. Lateral grooves near the gum-line of incisors and canines are interpreted as the result of stripping lianas for supplemental water. Food may have included an omnivorous diet that favored the scavenging of large carcasses. The presence of healed bite-mark trauma on the frontal, lachrymal, and maxillary bones suggests that some populations of entelodonts engaged in non-lethal intraspecific combat.*;*This dissertation includes a CD that is compound (contains both a paper copy and a CD as part of the dissertation). The CD requires the following application: Microsoft Office. Artiodactyla, Fossil ; Artiodactyla, Fossil Classification. ; Identification. Northern Illinois University. aCN bNGL http://pqdt.bjzhongke.com.cn/Detail.aspx?pid=e%2bV8Eo9DemA%3d NGL Bs500 rCNY371.35 ; h1 xhbs1001