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.

缅甸曼德勒地区Pa-thin地区Naungkangyi组的Hwe Mawng紫色页岩成员（Hirnantian）系统地描述了一种新的，最新的奥陶纪腕足动物群，揭示了典型的Hirnantia动物群中最多样化的代表之一。所研究的Rhynchonelliformean，craniiformean和linguliformean腕足动物属于23个属和一些不确定的类群，其中最丰富的Kinnella属以及四个常见属（Paromalomena，Pseudopholidops，Fardenia和Dalmanella）以及其他属（如Cliftonia，Draborthis，Hindella，首次记录了Hirnantia，Leptaena，Mirorthis，Plectothyrella，Skenidioides和Xenocrania）。这种高多样性的Hirnantia动物区系代表着在奥陶纪全球危机末期时Sibumasu Terrane底栖生物内的生态分化。在本文中被称为Kinnella - Paromalomena协会的古细菌单位被分配给较低的BA3。本文包括一个分类学修订，得出以下结论：1）曾庆华等。和Yichangomena Zeng等。被视为Eostropheodonta的初级同义词班克罗夫特 2）曾湖北等。被认为是Coolinia Bancroft的一种少年形式；3）Paramirorthis Zeng等。被认为是Mirorthis Zeng的一个不成熟的成长阶段；4）Shanomena Cocks and Fortey被视为Paromalomena Rong的初级同义词；5）Scenidium？medlicotti里德被调任的模式种Kinnella BERGSTROM更换赫南特贝？基拉奈寺。Hirnantia的分布Sibumasu Terrane的缅甸，泰国和云南西部的动物区系突显了曼德勒动物群的独特性，对Hirnantia动物区系和其他Sibumasu的分析表明，Sibumasu在中后期和后期没有远离华南和拉萨古板块。晚奥陶纪。