Number of the records: 1
.i.Qasimia yunnanica./i. sp. nov., a marattialean fern with bivalvate synangia from the Lopingian of Southwest China
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SYSNO ASEP 0546176 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Qasimia yunnanica sp. nov., a marattialean fern with bivalvate synangia from the Lopingian of Southwest China Author(s) Guo, Y. (CN)
Zhou, Y. (CN)
Bek, Jiří (GLU-S) RID, SAI, ORCID
Yang, S.-L. (CN)
Feng, Z. (CN)Article number 104497 Source Title Review of Palaeobotany and Palynology. - : Elsevier - ISSN 0034-6667
Roč. 293, October 2021 (2021)Number of pages 16 s. Language eng - English Country NL - Netherlands Keywords Qasimia yunnanica ; Marattialeans ; Bivalvate synangia ; In situ spores ; Lopingian ; China OECD category Paleontology R&D Projects GA19-06728S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support GLU-S - RVO:67985831 UT WOS 000694016900011 EID SCOPUS 85111510655 DOI 10.1016/j.revpalbo.2021.104497 Annotation The Lopingian (upper Permian) in Southwest China yields diverse marattialean plants, however, most of these have been recorded as isolated fragments of fronds, pinnules, and stems. Marattialean Qasimia specimens were recently collected from the upper Permian Xuanwei Formation of Yunnan Province, Southwest China. The well-preserved synangia, sporangia, and prominent in situ spores permitted the emendation of the genus Qasimia and the establishment of the species Q. yunnanica sp. nov. This plant possesses alternately or sub-oppositely arranged fertile pinnules with abaxially attached synangia. The synangia are sessile and bivalvate, with a length nearly half the width of the pinnules. A synangium valve consists of approximately 20 long ellipsoids and laterally fused sporangia. In situ spores of the Punctatosporites type are monolete, 97 × 74 μm on average, with a microverrucate/microgranulate to vermiculate sculpture, these represent the largest in situ spores of this type. The sporangial wall has at least two layers of polygonal/elongated cells. The exine comprises a perine, sexine, and nexine. The characteristics of the marattialeans with bilaterally symmetrical synangia were analyzed based on a comparison of eight related genera in the late Paleozoic and Marattia after the late Paleozoic. The Qasimia-type synangium represents the earliest occurrence of bivalvate synangium, which is a typical feature of modern marattialeans. Although the origin of the bilaterally symmetrical marattialean synangia remains elusive, marattialeans with this type of synangia first appeared in the Euramerica during the late Carboniferous and then migrated to the Cathaysia, where they became more prosperous until the late Permian. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0034666721001214
Number of the records: 1