Permian Fusulinid Rugososchwagerina (Xiaoxinzhaiella) from the Shan Plateau, Myanmar: Systematics and Paleogeography

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY
Hao Huang, Xiaochi Jin, Yukun Shi
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引用次数: 5

Abstract

Eastern Myanmar is an indispensable part of the Cimmerian Continent with Gondwana provenance. Fusulinids from Eastern Myanmar remain poorly known despite their biochronological and paleogeographical significance. This paper describes Rugososchwagerina (Xiaoxinzhaiella) subrotunda sp. nov. and Chusenella quasidouvillei of Murgabian age (Middle Permian) from the Thitsipin Formation at the Pindaya in the Shan Plateau, Eastern Myanmar. Taxonomic analysis of this new collection and of Rugososchwagerina (s.l.) in the literature leads us to suppress Xiaoxinzhaiella Shi, Yang & Jin, 2005 as a subgenus of RugososchwagerinaMiklukho-Maklay, 1959. This subgenus is diagnosed with much tighter coiling and reduced septal folding in juvenarium as well as relatively smaller test diameter throughout the ontogeny, compared with Rugososchwagerina (s.s.) which is typified by R. yabeiSkinner & Wilde, 1966. Furthermore, our comprehensive review reveals that the known occurrences of R. (Xiaoxinzhaiella) are strictly confined within blocks that previously constituted the Cimmerian Continent during the Permian period, and they were even more widespread than Rugososchwagerina (s.s.) among these blocks. Therefore, the previous understanding that Rugososchwagerina (s.l.) is characteristic for the Middle Permian Cimmerian region can be refined. We propose that R. (Xiaoxinzhaiella) is more appropriate as the truly endemic foraminiferal index signifying Cimmerian affinity.
缅甸掸邦高原二叠纪Fusulinid Rugososchwagerina (Xiaoxinzhaiella):系统与古地理
缅甸东部是根瓦纳(Gondwana)源区西米里亚大陆不可缺少的一部分。尽管缅甸东部的Fusulinids具有生物年代学和古地理意义,但人们对其知之甚少。本文描述了缅甸东部掸邦高原品达雅Thitsipin组Murgabian时代(中二叠世)Rugososchwagerina (Xiaoxinzhaiella) subrotunda sp. 11和Chusenella quasidouvillei。通过对该新属和文献中的Rugososchwagerina (s.l.)的分类分析,我们发现Xiaoxinzhaiella Shi, Yang & Jin, 2005是Rugososchwagerina的一个亚属。与R. yabeiSkinner & Wilde, 1966所描述的Rugososchwagerina (s.s.)相比,该亚属在整个个体发育过程中被诊断为具有更紧密的卷曲和更少的间隔折叠,以及相对较小的测试直径。综合分析表明,R. (Xiaoxinzhaiella)的已知产状严格局限于二叠纪前构成西米里亚大陆的地块内,其分布范围甚至比Rugososchwagerina (s.s.)更为广泛。因此,前人关于Rugososchwagerina (s.l.)是中二叠统西米叠统地区特有的认识可以进一步完善。我们认为R. (Xiaoxinzhaiella)更适合作为真正地方性的有孔虫指数,表明其具有西米纪亲缘性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
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