CAJ | 학술논문

记述了发现于内蒙古苏崩晚古新世格沙头期的中兽类软食中兽Hapalodectes属的一个新种.这是软食中兽在中国古新世地层中的首次发现,也是亚洲格沙头期的第二种软食中兽.已有的系统学和生物地层学证据支持软食中兽属和软食中兽科(Hapalodectidae)亚洲起源的观点.软食中兽显然是在古新世-始新世极热事件(PETM)期间通过白令陆桥扩散到北美大陆的,因而符合"东方伊甸园"学说中的生物地理格局.软食中兽有限的(即非欧洲的)地理分布使得我们可以重建该属生物地理学历史.如同软食中兽一样的"东方伊甸园"式的扩散模式,可以看作是大的环境变化事件导致多个支系产生相似的系统学和生物地理学分布格局的生物地理扩散机制.严格地检查了所谓的在古新世-始新世界线上或其附近的与"东方伊甸园"模式相矛盾的大陆间哺乳动物扩散事例,结果发现这些例子都是不可靠的."东方伊甸园"生物地理学说充分解释了PETM时期哺乳动物群更替以及劳亚古陆哺乳动物地理分布格局的成因.
기술료발현우내몽고소붕만고신세격사두기적중수류연식중수Hapalodectes속적일개신충.저시연식중수재중국고신세지층중적수차발현,야시아주격사두기적제이충연식중수.이유적계통학화생물지층학증거지지연식중수속화연식중수과(Hapalodectidae)아주기원적관점.연식중수현연시재고신세-시신세겁열사건(PETM)기간통과백령륙교확산도북미대륙적,인이부합"동방이전완"학설중적생물지리격국.연식중수유한적(즉비구주적)지리분포사득아문가이중건해속생물지이학역사.여동연식중수일양적"동방이전완"식적확산모식,가이간작시대적배경변화사건도치다개지계산생상사적계통학화생물지이학분포격국적생물지리확산궤제.엄격지검사료소위적재고신세-시신세계선상혹기부근적여"동방이전완"모식상모순적대륙간포유동물확산사례,결과발현저사례자도시불가고적."동방이전완"생물지이학설충분해석료PETM시기포유동물군경체이급로아고륙포유동물지리분포격국적성인.
A new species of the mesonychian mammal genus Hapalodectes is described from the Gas-hatan(late Paleocene)site of Subeng in Nei Mongol(Inner Mongolia).This is the first Paleocene record of Hapalodectes from China.and the second Gashatan species of Hapalodectes to be recorded from Asia.Available phylogenetic and biostratigraphic evidence supports an Asian origin for Hapalo-dectes(and Hapalodectidae).Hapalodectes apparently dispersed across Beringia coincident with PETM warming to colonize North America,thereby conforming to the "East of Eden" biogeographic Dattern.Reconstructing the historical biogeography of Hapalodectes is facilitated by its restricted(i.e.,non-European)geographic distribution."East of Eden" dispersal such as that shown by Hapalo-dectes qualifies as an excellent example of geo-dispersal,whereby a major perturbation of the physical environment allows muhiple clades to exhibit similar biogeographic and phylogenetic patterns.Pur-ported examples of intercontinental mammalian dispersal at or near the Paleocene-Eocene boundary that conflict with the "East of Eden" pattern are critically examined and found to be wanting.The "East of Eden" biogeographic pattern adequately explains mammalian faunal turnover and Laurasian mammalian biogeography during the PETM.