Brachiopods from Cambrian Series 2, Stage 4 carbonate strata of the Byrd Group in the Central Transantarctic Mountains, East Antarctica, are described for the first time. These include six lingulate, one paterinate and one rhynchonelliform taxon, including the new lingulate brachiopod Plicarmus wildi gen. et sp. nov. The biostratigraphy correlates closely to the brachiopods recently reported from the Xinji Formation (Shuiyu section) in North China, as well as brachiopods recovered from the Dailyatia odyssei Zone across the Arrowie Basin of South Australia. These findings also support the previously identified close palaeobiogeography of these regions. The first unambiguous example of the acrotretid brachiopod Eohadrotreta zhenbaensis Li & Holmer outside South China is also identified in the context of its ontogenetic stages. Well‐preserved specimens of the acrotheloid Schizopholis yorkensis (Holmer & Ushatinskaya) facilitate a new reconstruction of its musculature and visceral region. These data are synthesized into a new cladistic analysis that resolves Acrotheloidea as a well‐supported monophyletic clade and supports previous hypotheses of a morphocline in acrotheloid evolution.

中文翻译：

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来自南极东部中部南极山脉的伯德群的腕足动物（寒武纪系列2，第4期）：生物地层学，系统发生学和系统学

首次描述了南极东部中部南极山区的伯德群的寒武纪系列2的第4阶段碳酸盐岩地层的腕足动物。其中包括六种舌状，一具eri齿和一个菱形类群，其中包括新的舌状腕足类Plicarmus wildi gen。等。十一月 生物地层学与华北地区新集组（水yu段）最近报道的腕足类动物以及从南澳大利亚阿奇里盆地跨海的Dataatia odyssei地区发现的腕足类动物密切相关。这些发现也支持这些地区以前确定的近古生物地理学。珍巴氏棘手足腕兽的第一个明确实例在华南以外的Li＆Holmer也从其个体发育阶段的角度得到了确认。保存良好的顶体类脂溢性血吸虫（Holmer＆Ushatinskaya）标本有助于对其肌肉组织和内脏区域进行新的重建。这些数据被综合到一个新的分类分析中，该分析将Acrotheloidea解析为一个有良好支持的单系统进化枝，并支持了Acrotheloid进化过程中吗啉的先前假设。