New species of fossil Dryopterites from the Lower Cretaceous in the Zhongkouzi Basin, Beishan area, Northwest China, and its geological significance
New species of fossil Dryopterites from the Lower Cretaceous in the Zhongkouzi Basin, Beishan area, Northwest China, and its geological significance
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DOI：
10.1080/08912963.2021.2022135
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发表时间：
2022-01
影响因子：
1.4
通讯作者：
Wenxiu Ren;Guang Wu;Lei Han;Yifan Hua;Bai-Nian Sun
中科院分区：
文献类型：
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作者：
Wenxiu Ren;Guang Wu;Lei Han;Yifan Hua;Bai-Nian Sun
摘要在北山地区中口子盆地下白垩统赤金堡组中采集了鳞毛蕨属植物叶的化石。本文记述了一新种，北山鳞翅虫Dryopterites beishanensis Ren and Sun sp. nov.根据其大体形态结构和生殖特征的细节进行了描述。叶三回羽状，主轴宽，小羽片小，卵形或长卵形，以狭窄的角度附着在轴上，顶端钝。孢子囊圆形或圆形肾形，生于侧脉，数量1 - 2对。孢子为近圆形或椭圆形，单裂缝，有28至41微米长的孔。外壁不光滑。这些新化石代表了赤金宝组中鳞羽石的首次记录。此外，根据不同的化石记录，Dryopterites属最有可能起源于早白垩世（Hauterivian至Barremian时代）的东亚。这一新化石为鳞羽石的起源问题提供了新的证据。
ABSTRACT Fossil remains of Dryopterites fern foliage were collected from the Lower Cretaceous Chijinbao Formation in the Zhongkouzi Basin, Beishan area, Northwest China. A new species, Dryopterites beishanensis Ren and Sun sp. nov., is described on the basis of gross morphological structure and details of reproductive characters. Fronds are tripinnate, the main rachis is broad, and pinnules are small, oval or long ovate, and attached at narrow angles to the rachis, with apices obtuse. Sporangia are rounded or rounded-reniform and borne on the lateral vein, with one to two pairs in number. Spores are suborbicular or oval and monolete, with laesura 28 to 41 µm long. The extine is not smooth. The new fossils represent the first record of Dryopterites from the Chijinbao Formation. Additionally, according to different fossil records, the genus Dryopterites most likely originated in East Asia in the Early Cretaceous (Hauterivian to Barremian age). The new fossil provides new evidence on concerning the origin of Dryopterites.