Reconstruction of a Small-Leaved Cordaitalean Plant from the Permian of North China by Means of Cuticular Analysis
Reconstruction of a Small-Leaved Cordaitalean Plant from the Permian of North China by Means of Cuticular Analysis
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DOI：
10.1086/704375
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发表时间：
2019-07
影响因子：
2.3
通讯作者：
Malte Backer;B. Bomfleur;H. Kerp
中科院分区：
文献类型：
--
作者：
Malte Backer;B. Bomfleur;H. Kerp
研究的优先权。东亚和东南亚晚古生代华夏植物群的典型植物类群包括Noeggerathialeans、古蕨类植物和特有的蕨类植物，但也有大量的泥炭形成成分。尽管煤球植物群允许一些科达植物的整株重建，华夏科达植物的分类仍然在很大程度上依赖于宏观形态特征。山西帕楼沟剖面下石盒子组（Guadalupian;二叠纪）出露了保存完好的大型植物群，有丰富的大Cordaites叶，并伴有典型的华夏属，如Tingia，Yuania，Cathaysiopteris和Emplectopteris。初步结果。大量的浸解已经产生了丰富的，保存得非常好的科代石古生物，包括第一次记录的轴，球果，种子和完整的矮小的叶子。相似的诊断表皮特征，特别是在特征气孔结构和expresement，以及在原位花粉粒的存在下，恢复从球果和种子，使我们能够重建这些器官成一个单一的整株cordaitalean物种。结论.这种独特的性状组合使一个新的属和种--小叶望菊（Wangjunia microphylla）成立。不同的角质层仍然保存的不寻常的质量允许这个新种与其他华夏和欧美Cordaitales的详细比较。小叶望菊属可能是晚石炭世至中二叠世华北微大陆上一个独特的科达语系的代表。
Premise of research. Typical plant groups of the late Paleozoic Cathaysian floras from East and Southeast Asia include noeggerathialeans, gigantopterids, and endemic pteridosperms, but also cordaitaleans are abundant peat-forming elements. Even though coal ball floras have allowed whole-plant reconstructions of some cordaites, the classification of Cathaysian cordaitalean foliage still largely relies on macromorphological features. The Lower Shihhotse Formation (Guadalupian; Permian) exposed in the Palougou section in Shanxi, North China, hosts well-preserved macrofloras with abundant, large Cordaites leaves accompanied by typical Cathaysian genera, such as Tingia, Yuania, Cathaysiopteris, and Emplectopteris. Pivotal results. Bulk macerations have yielded abundant, exceptionally well-preserved cordaite cuticles, including the first records of axes, cones, seeds, and complete dwarf-sized leaves. Similarities in diagnostic epidermal features—especially in the characteristic stomatal architecture and arrangement—as well as the presence of in situ pollen grains recovered from cones and seeds allow us to reconstruct these organs into a single whole-plant cordaitalean species. Conclusions. The unique combination of characters enables the erection of a new genus and species, Wangjunia microphylla. The unusual quality of preservation of the various cuticle remains allows detailed comparisons of this new species with other Cathaysian and Euramerican Cordaitales. Wangjunia microphylla may be a representative of a distinctive cordaitalean lineage that inhabited the North China microcontinent from the Late Carboniferous to the middle Permian.