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内蒙二马营组发现的肯氏兽类

1980年 第18卷 第2期: 94~99

发表日期:2009-04-28李志恒来源:放大 缩小

编辑: 李锦玲

摘要: During the field work of 1976, a kannemeyerid skull was discovered together with several postcranial bones from Inner Mongolia by a team of IVPP.
    In comparison with kannemeyerids so far known from China the said skull seems to be more closely related to Shanbeikannemeyeria xilougouensis (Cheng, in Press) in following characteristics. Its pre-orbital region is short, basicranial axis is short and curved, and occipital plate is rather high. As the expanded squamosad extends much forward, the occipital plate is extremely inclined.
    In spite of their similarities, there are still some differences between our specimen and S. xiloxugouensis. The posterior part of the skull of the new specimen is narrower than that of S. xilougouensis, the maxillary process is smaller, the foramen magnum and occipital condyle are larger and the tusks are longer. So a new specific name, S.buerdongia, is given to the new specimens.
    Both S. xilougouensis and S. buerdongia were collected from the bottom layer of Er-ma-ying formation, which is under the bed bearing Sinokannemeyeria-fauna. The age of Sinokannemeyeria-fauna was recently affirmed to be Early Middle Triassic. As the case stands, Shanbeikannemeyeria shows much more similarities to Kannemeyeria of the Cynognathus zone than to Sinokannemeyeria and Parakannemeyeria. So the lower part of Er-ma-ying formation is suggested here to be correspond to Cynognathus zone of South Africa. The age of Shanbeikannemeyeria might probably be Late Early Triassic.

卷期:18卷 02期

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