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The latest Ordovician Hirnantia brachiopod fauna of Myanmar: Significance of new data from the Mandalay Region

Rong, Jia-Yu; Aung, Kyi Pyar; Zhan, Ren-Bin; Huang, Bing; Harper, David A.T.; Chen, Di; Zhou, Hang-Hang; Zhang, Xiao-Le

The latest Ordovician Hirnantia brachiopod fauna of Myanmar: Significance of new data from the Mandalay Region Thumbnail


Authors

Jia-Yu Rong

Kyi Pyar Aung

Ren-Bin Zhan

Bing Huang

Di Chen

Hang-Hang Zhou

Xiao-Le Zhang



Abstract

A new, latest Ordovician brachiopod fauna is systematically described from the Hwe Mawng Purple Shale Member (Hirnantian) of the Naungkangyi Group of the Pa-thin area, Mandalay Region, Myanmar, revealing one of the most diverse representatives of the typical Hirnantia Fauna. Rhynchonelliformean, craniiformean and linguliformean brachiopods studied belong to 23 genera and a few indeterminate taxa, among which the most abundant genus Kinnella, along with the four common genera (Paromalomena, Pseudopholidops, Fardenia, and Dalmanella), and other genera (such as Cliftonia, Draborthis, Hindella, Hirnantia, Leptaena, Mirorthis, Plectothyrella, Skenidioides, and Xenocrania) are recorded for the first time. This high diversity Hirnantia Fauna represents an ecological differentiation within the benthos of the Sibumasu Terrane during the end Ordovician global crisis. The palaeoeco-unit named herein as the Kinnella-Paromalomena Association is assigned to lower BA3. This paper includes a taxonomic revision with the following conclusions: 1) Sinomena Zeng et al. and Yichangomena Zeng et al. are treated as junior synonyms of Eostropheodonta Bancroft; 2) Hubeinomena Zeng et al. is regarded as a juvenile form of Coolinia Bancroft; 3) Paramirorthis Zeng et al. is considered an immature growth stage of Mirorthis Zeng; 4) Shanomena Cocks and Fortey is treated as a junior synonym of Paromalomena Rong; 5) Scenidium? medlicotti Reed is redesignated as the type species of Kinnella Bergström to replace Hirnantia? kielanae Temple. The distribution of the Hirnantia Fauna in Myanmar, Thailand and western Yunnan of the Sibumasu Terrane highlights the distinctive nature of the Mandalay fauna, and the analyses of the Hirnantia Fauna and others of Sibumasu shows that Sibumasu was not located far from the South China and Lhasa palaeoplates during late Middle and Late Ordovician.

Citation

Rong, J., Aung, K. P., Zhan, R., Huang, B., Harper, D. A., Chen, D., …Zhang, X. (2020). The latest Ordovician Hirnantia brachiopod fauna of Myanmar: Significance of new data from the Mandalay Region. Palaeoworld, 29(1), 1-30. https://doi.org/10.1016/j.palwor.2019.07.002

Journal Article Type Article
Acceptance Date Jul 3, 2019
Online Publication Date Jul 12, 2019
Publication Date Mar 31, 2020
Deposit Date Sep 6, 2019
Publicly Available Date Mar 29, 2024
Journal Palaeoworld
Print ISSN 1871-174X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 29
Issue 1
Pages 1-30
DOI https://doi.org/10.1016/j.palwor.2019.07.002

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