Endo beast
endotherium
"Eye" can not be determined a classification of the original position of mammals, for the time being attributed to mammalian animals subclass Gang Gang true beast times, it is only ever found the exact truth of the Mesozoic fossil mammal. Fossils are discovered during the Japanese invasion of China, between 1947 when the husband of the deer released to commemorate the generic name of "Manchuria Geological Survey," Long time director of Endo, species name (ninomii) the commemoration of Dalian "and the South over the natural Resources Museum "director of the new field researchers see k.. Only samples found in the lower left teeth, jaws have dropped off the front and the preservation of three molars, a right mandible and the scapula and humerus fragments. The animals are characterized by flat upper and lower teeth bone, relative or even slim. Delivery from front to back three molars small, molar pestle scissors, the lower teeth and under the seat and seat with well-developed, each with three teeth. Next higher gear seat, the next with a wide seat. Developed before the column tip, saved on the second lower molar. Fossil site in Liaoning Province, Fuxin City, 10 kilometers north of the new Chiu coal mines, production of fossil-bearing strata is in Fuxin coal seam. Geological field that the era of the Fuxin coal is the Late Jurassic, and foreign animal paleontology community believes that the era of Endo should not earlier than the early Cretaceous.
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_'s Survival
Late Jurassic or later
Location survival _
Fuxin, Liaoning, China
Of species _
Mammalia mammalia
True mammals eutheria
The earliest insect fossils found in North America, mainly the west (the Rocky Mountain region) and Asia (mainly the Mongolian People's Republic) of the Lower Cretaceous (about one hundred million years). Fuxin, Liaoning, China Endo beast (endotherium), the times may be Late Jurassic or later, may be there is the earliest known placental fossils. The earliest primate fossils found in Montana (Late Cretaceous), ankle section of the first class are also found in the same layer.
Recently in South America (Argentina) found Cretaceous fossils similar to the purpose of poor teeth. The purpose of fossils in Asia (China and Mongolia) Paleocene also has found. These significant changes in the past on the origin and dissemination of the history of mammals hypothesis.
In the new generation of communication and distribution of mammals in North America and Asia, the Bering land bridge between the Bering Sea region (beringia), the Isthmus of Panama, the Indian subcontinent landmass in the Eocene (about 50 million years ago) with the "ancient Asian continent "and then hit" Ancient Mediterranean "(including Asian part; thethys sea) the disappearance (or south) and the Qinghai-Tibet Plateau uplift and so on, modern mammals (primarily real beast) in the distribution of the face, around the mammal fauna plays an important role in the composition.
True mammals, including extinct and extant placental mammals are, divided into 30 orders, the relationship between these objectives, or over the purpose of a unified opinion has not divided, but there are still some among these objectives more visible close genetic relationship. |