A new species of Pleuromeia (Lycopsid) from the upper Middle Triassic of Northern China and discussion on the spatiotemporal distribution and evolution of the genus
Shenghui Deng, Yuanzheng Lu, Ru Fan, Xueying Ma, Dan Lyu, Zhong Luo, Yanqi Sun
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引用次数: 0
Abstract
Pleuromeia Corda is an iconic lycopod genus in the Early Triassic floras of the world. Pleuromeia fossils are very significant in stratigraphy and palaeoenvironmental interpretation and have been regarded as an important Lower Triassic index fossil. Although some recent studies show that the genus occurred in the lower part of the Middle Triassic, no definite Pleuromeia has been reported from the late Middle Triassic and the younger strata so far. In this paper, some reproductive organ fossils of Pleuromeia from the upper Middle Triassic Tongchuan Formation in Shaanxi Province (belonging to the Ordos Basin), North China, are described for the first time, belonging to the new species Pleuromeia obovata Deng nov. sp. Highly accurate dating results of tuff layers indicate that the age of the new species is between 241.06 ± 0.12 Ma and 241.558 ± 0.093 Ma, equivalent to the early Ladinian. This is the youngest species of genus Pleuromeia so far. Spatiotemporal distribution of Pleuromeia indicates that the genus first appeared in the Induan (Early Triassic) in North China, occurred widespread and flourished in both Laurasia and Gondwana during the Olenekian (late Early Triassic), declined from the Anisian (early Middle Triassic), survived in the Ladinian in North China, and may have gone extinct as early as the end of the Middle Triassic. North China may well have included the place of origination and the last habitats of this genus.
银杏属(Pleuromeia Corda)是世界早三叠纪植物区系中一个标志性的石松属。沉积层化石在地层学和古环境解释中具有重要意义,是下三叠统重要的指示化石。虽然最近的一些研究表明该属出现在中三叠世的下半部分,但到目前为止还没有明确的中三叠世晚期和更年轻地层的盖层属的报道。本文首次描述了华北地区陕西上三叠统铜川组(属于鄂尔多斯盆地)的一些胸膜虫生殖器官化石,属新种Pleuromeia obovata Deng nov. sp.凝灰岩层高精度定年结果表明,该新种的年龄在241.06±0.12 Ma ~ 241.558±0.093 Ma之间,相当于早拉旦世。这是迄今为止最年轻的银杏属。该属的时空分布表明,该属最早出现在华北的Induan(早三叠世),在oleneian(早三叠世晚期)在Laurasia和Gondwana广泛分布和繁盛,从Anisian(早三叠世早期)开始衰落,在华北的Ladinian幸存,可能早在中三叠世末就灭绝了。华北很可能包括了这个属的起源地和最后的栖息地。
期刊介绍:
Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils.
Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.