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

A New Species of Cupressinocladus from the Lower Cretaceous of Guyang Basin, Inner Mongolia, China and Cluster Analysis
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内蒙古固阳盆地下白垩统柏树一新种及聚类分析

DOI:
10.1111/1755-6724.13355
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发表时间:
2017-08
期刊:
Acta Geologica Sinica(English Edition)
影响因子:
--
通讯作者:
Bainian Sun
Bainian Sun
中科院分区:
其他
文献类型:
--
作者:
Peihong Jin;Teng Mao;Junling Dong;Zixi Wang;Mingxuan Sun;Xiaohui Xu;Baoxia Du;Bainian Sun

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柏枝柏(Cupressinocladus Seward)是针叶树的一个化石属,具有生殖器官的针叶树化石非常罕见。一般来说,很难理解与其他针叶树的天然亲缘关系。本文记述了一新种,古阳柏枝柏Cupressinocladus guyangensis P.H. Jin et B.N. Sun sp. nov.,本文报道了内蒙古北方固阳盆地下白垩统固阳组中含有未成熟雌球花的树枝。叶枝交互对生。叶交互对生,覆瓦状,鳞片状,弱二型,背面有纵向腺体。气孔复合体为单唇型,单环,不规则排列,沿着叶缘分布。未成熟的雌球花近球形,有6-8个珠鳞,3个近球形胚珠在珠鳞基部排成一行。此外,我们进行了聚类分析,使用统计和机器学习工具箱的23个化石和现存物种的16个形态特征的基础上。结果表明,该新种与现存的柏木Cupressus funebris Endl.并且可能与它有最接近的系统亲缘关系。
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.
DOI: 10.1371/journal.pone.0115141
发表时间: 2014
期刊: PloS one
影响因子: 3.7
作者:
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通讯作者: Sun BN
DOI: 10.1111/1755-6724.12727
发表时间: 2016-06
期刊: Acta Geologica Sinica (English Edition)
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影响因子: 11.1
作者:
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