A New Species of Cupressinocladus from the Lower Cretaceous of Guyang Basin,Inner Mongolia,China and Cluster Analysis

作     者：JIN Peihong MAO Teng DONG Junling WANG Zixi SUN Mingxuan XU Xiaohui DU Baoxia SUN Bainian 

作者机构：School of Earth Sciences & Key Laboratory of Mineral Resources in Western China(Gansu Province)Lanzhou University School of Electrical Engineering and Computer ScienceLouisiana State University 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2017年第91卷第4期

页      面：1200-1214页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：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.lzujbky2016-201) the US Louisiana Board of Regents under grant LEQSF(2017-20)-RD-A-29 

主　　题：Cupressinocladus Immature female cone Lower Cretaceous Cluster analysis New species 

摘      要：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 Cupressusfunebris Endl. and might have nearest systematic affinities to it.