A New Species of Cupressinocladus from the Lower Cretaceous of Guyang Basin, Inner Mongolia, China and Cluster Analysis
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We are thankful to Dr. Jingyu Wu (Lanzhou University, China) and Dr. Gongle Shi (Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences) for their kindness to provide some helpful references. This research was financially supported by the National Basic Research Program of China (973 Program) (No. 2012CB822003), the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20120211110022), the National Natural Science Foundation of China (No. 41402007), the Fundamental Research Funds for the Central Universities (No. lzujbky-2016-201), and the US Louisiana Board of Regents under grant LEQSF (2017-20)-RD-A-29.

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    Abstract:

    Cupressinocladus Seward is a fossil genus of conifers and conifer fossils with reproductive organs are very rare. In general, it is difficult to understand the natural affinities with other conifers. In this paper, a new species, Cupressinocladus guyangensis P.H. Jin et B.N. Sun sp. nov., is reported based on branches with immature female cones from the Lower Cretaceous Guyang Formation of the Guyang Basin in Inner Mongolia, northern China. The foliage shoots are decussate. Leaves are decussate, imbricate, scale-like, weakly dimorphic, and bear longitudinal glands on the abaxial view. Stomata complexes are haplocheilic, monocyclic, irregularly arranged, and spread along the leaf margin. Immature female cones are subglobose with 6–8 cone scales, and three subglobose ovules arranged in a row at the base of the cone scales. Moreover, we performed cluster analysis using a statistics and machine learning toolbox for 23 fossils and extant species based on 16 morphological characters. The result implies that the new species bears a close resemblance to the extant Cupressus funebris Endl. and might have nearest systematic affinities to it.

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JIN Peihong, MAO Teng, DONG Junling, WANG Zixi, SUN Mingxuan, XU Xiaohui, DU Baoxia, SUN Bainian.2017. A New Species of Cupressinocladus from the Lower Cretaceous of Guyang Basin, Inner Mongolia, China and Cluster Analysis[J]. ACTA GEOLOGICA SINICA(English edition),91(4):1200~1214

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  • 最后修改日期:2017-03-17
  • 在线发布日期: 2017-08-18
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