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    Home > Food News > Food Articles > Progress has been made in the systematic study of bird-like birds in the Meso-modern generation

    Progress has been made in the systematic study of bird-like birds in the Meso-modern generation

    • Last Update: 2020-12-31
    • Source: Internet
    • Author: User
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    Short-chested bird-like bird and Ma's bird skull comparison (Wang Min)short-chested bird-like bird (
    ) positive type (Wang Min)Li's bird (
    ) positive type (wang Min-like)
    Recently, the Journal of Systems Paleontology published the paleontology spine of the Chinese Academy of Sciences Wang Min, Liu Qingguo, Li Zhiheng, Zhou Zhonghe of the Institute of Animals and Paleoanthrology have completed the work on the diversity and branch system of yanornithidae, suggesting that the bird family currently includes three genus and species, and that the whole ostrich family exceeds even the other early Cretaceous bird species in terms of body diversity.
    Ostrich belongs to a larger species of bird species that lived in the early Cretaceous period (about 125 million years ago), and this group recorded the earliest emergence of fish-eating as a food in the evolution of birds. Because of its slender upper and lower jaws covered with a large number of teeth, so the bird section of the identification is high.
    year, about 40 fossils have been classified by different scholars into the Ostrich Family, created by two species, both of which belong to the Yanornis genus. In contrast, there are fewer fossils of today's birds found, often representing only one specimen represented by a positive type.
    Although the number of fossils in the Ostrich family is large, but for these fossils there is still a lack of detailed comparative anatomical research, the identification characteristics of the named genus from today is more of a common ancestry of the entire current bird species. The lack of clear classification greatly limits the understanding of the evolutionary diversity of such a group.
    by comparing the morphology of all the bird specimens found, the new study found two new genus: Similiyanornis brevipectus and Abitusavis lii. Short-breasted bird-like bird was first recorded in Liu Qingguo's master's thesis and classified as a new species into the bird genus. However, the shape of the short-chested bird and the bird genus representative species Ofrnis martini is very different, such as tear bone is "T" type, the first tooth of the tooth bone is unusually large, the jaw has a pair of window holes, the front jaw side has a large window hole, the front joint of the cervical vertebrae protrusion longer than the rear joint protrusion, the utopian bone protrusion to the inside, so the new study as a new genus.
    the positive specimen of the Li's bird (whose name is "Li's" and dedicated to the late Mr. Li Yutong of the Institute of Paleontology and Paleoanthropology of the Chinese Academy of Sciences, which means "parting"), was initially considered to be a specimen of the Ma's swallow bird, but its large morphological and body shape differences with the Mars bird indicate that this classification is incorrect. The main identification characteristics of Li's bird include the post-joint protrusion with obvious jaw development, the healing vertebrae including 8 cones, the front and outer protrusions of the chest bone are not developing and the outer protrusion ends are not puffed.
    At the same time, the study also revised the classification of all specimens previously classified into the genus of the bird, and determined the identification characteristics of the Macy's ostrich, which it said belonged to the similar name of the mackered Yanornis guozhangi.
    Wang Min and others carried out a study on the morphological diversity of the bird species after the system was determined, and found that the extent of the change in the length of the ostrich's front and hind limbs exceeded even the total of all other congenital bird species. Variations in the length of the front and hind limbs reflect ecological differences within the Ostrich department, which may explain why the Osteology is more diverse than other current bird species.
    this research has been supported by the National Science Excellence Youth Fund, the Basic Science Center project, and the "0-1" original innovation decade merit-based project of the Chinese Academy of Sciences' Cutting-Edge Science Key Research Program. (Source: Cui Xueqin, Chinese Journal of Science)
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