| 词条 | Asioryctitheria |
| 释义 |
| name = Asioryctitheria | fossil_range = Early-Late Cretaceous | image = Asioryctes nemegtensis.jpg | image_width = 250px | image_caption = Asioryctes nemegtensis skull | regnum = Animalia | phylum = Chordata | classis = Mammalia | subclassis = Theria | infraclassis = Eutheria | ordo = †Asioryctitheria | ordo_authority = Novacek et al., 1997 | subdivision_ranks = Genera | subdivision =
}} Asioryctitheria ("asian digging beasts") is an extinct order of early eutherians. Skull structureWith the exception of Prokennalestes, these advanced forms lacked a Meckelian groove. Furthermore, they were equipped with double-rooted canines, a lower premolar with a reduced or absent metaconid and a more elongated lower premolar than their predecessors. In addition, the entoconid and hypoconulid on the lower molars are untwinned, the entotympanic is non-existent, the alisphenoid is enlarged, a Vidian foramen is present as well as a promontorium linked to the paroccipital process via the crista interfenestralis. ClassificationAsioryctitheria contains at least four genera and two families.[1][2]
References1. ^Mikko's Phylogeny Archive {{cite web|last=Haaramo|first=Mikko|year=2007|title=Basal Eutheria – placental mammals and relatives |url=http://www.helsinki.fi/~mhaaramo/metazoa/deuterostoma/chordata/synapsida/eutheria/eutheria_1.html |accessdate= 30 December 2015}} 2. ^Paleofile.com (net, info) {{cite web|url=http://www.paleofile.com/ |title=Archived copy |accessdate=2015-12-30 |deadurl=yes |archiveurl=https://web.archive.org/web/20160111195520/http://paleofile.com/ |archivedate=2016-01-11 |df= }}. {{cite web|url=http://www.paleofile.com/ |title=Taxonomic lists- Mammals |accessdate=30 December 2015 |deadurl=yes |archiveurl=https://web.archive.org/web/20160111195520/http://paleofile.com/ |archivedate=11 January 2016 |df= }} Further reading
External links
5 : Early Cretaceous genus first appearances|Late Cretaceous genus extinctions|Early Cretaceous mammals of Asia|Late Cretaceous mammals of Asia|Fossil taxa described in 1997 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。