Early Oligocene Calocedrus (Cupressaceae) from the Maoming Basin, South China, and its paleogeographic and paleoclimatic implications  

作　　者：Yan Wu Jian-Hua Jin Nan Li Hui-Min He Ting Chen Xiao-Yan Liu 

机构地区：[1]State Key Laboratory of Biocontrol,Guangdong Provincial Key Laboratory of Plant Resources,and School of Life Sciences,Sun Yat-sen University,Guangzhou 510275,China [2]Shenzhen Key Laboratory of Southern Subtropical Plant Diversity,Shenzhen 518004,China [3]National Cycad Conservation Center,Fairylake Botanical Garden,Shenzhen&Chinese Academy of Science,Shenzhen 518004,China

出　　处：《Journal of Systematics and Evolution》2019年第2期142-152,共11页植物分类学报（英文版）

基　　金：Foundation of China (Grant Nos. 41572011, 41210001, and 41661134049);Shenzhen Key Laboratory of Southern Subtropical Plant Diversity, the joint Project of the National Natural Science Foundation of China and the Russian Foundation for Basic Research (Grant Nos. 41611530701 and 17-54-53069);the Natural Environment Research Council of Research Councils UK (No. NE/P013805/1);the Fundamental Research Funds for the Central Universities (Grant No. i6lgjc28), and the Scientific Research Fund, Hongda Zhang,Sun Yat-sen University.

摘　　要：The genus Calocedrus Kurz is characterized by flattened branches covered with decussate and dimorphic leaves. In this study, we describe fossil foliage of Calocedrus discovered in the Shangcun Formation (early Oligocene) of the Maoming Basin, South China. The fossils have wedge‐shaped branchlet segments and scale‐like strongly dimorphic leaves, similar to the fossil species Calocedrus lantenoisi (Laurent) Tao. There have been no detailed studies of the morphological features and cuticle structures of C. lantenoisi. Therefore, a newly emended diagnosis of the species C. lantenoisi is given based on a detailed study of leaf morphology and cuticular characters exhibited by the Maoming fossils. This is one of the earliest fossil records of Calocedrus in the world, providing additional evidence for the early biogeographic history of this genus and supporting the inference that eastern Asian Calocedrus is primitive among all the living species. The extant species of Calocedrus are mainly distributed in mountainous regions. On the basis of the “nearest living relative” analysis, we propose that the Maoming Basin was adjacent to a mountainous region during the early Oligocene.

关 键 词：Calocedrus CUPRESSACEAE EARLY OLIGOCENE Maoming BASIN PALEOCLIMATE PALEOGEOGRAPHY 

分 类 号：Q[生物学]