The Cambrian Period, primarily known for animal life diversifying, experienced global extinctions. Pulses of extinction in Cambrian Series 2 are exemplified by the disappearance of archaeocyath sponges and olenelline and redlichiid trilobites. However, the effect of such extinctions on outer shelf organisms, as typify Burgess Shale‐type (BST) deposits, remains relatively unknown. The phylogeny of naraoiid arthropods, represented in BST deposits globally, has consequently been reconstructed from either side of the Series 2 – Miaolingian extinction event to evaluate the response of offshore marine organisms to Cambrian environmental perturbation. As soft anatomy is known for only a subset of naraoiid species, exoskeletal morphology has proven important. Misszhouia and Naraoia (Naraoia) are distinguished morphometrically by posterior shield length/width and anterior shield length/posterior shield length. Morphometry has also been used to strengthen the identification of some cryptic naraoiid species and revise stratigraphic ranges. A revised naraoiid phylogeny reveals Misszhouia as a monophyletic subgenus, the former genus Pseudonaraoia nests within Naraoia and is placed in synonymy, and the systematic position and status of the Subfamily Liwiinae are sensitive to character weighting. Ten species of Naraoiidae range across the Series 2 – Miaolingian boundary, all naraoiid lineages originating during the main BST window. The persistence of outer shelf naraoiids throughout the Series 2 extinctions suggests that deeper offshore marine environments were resilient to extinction during periods of environmental stress. This study provides novel empirical support for the asylum of BST communities, which may contribute to the taxonomic longevity and widespread geographic distribution of taxa in these biotas.

中文翻译：

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菜鸟节肢动物对早中寒武纪环境变化的系统发育响应

寒武纪以动物生活的多样化而著称，经历了全球性的灭绝。寒武纪系列2中的灭绝脉冲以古细菌海绵和油橄榄石和红荔枝三叶虫的消失为例。但是，这种灭绝对外部架子生物的影响（相对于Burgess页岩型（BST）沉积物为代表）仍然相对未知。因此，已从2系列–苗岭灭绝事件的任一侧重建了全球BST沉积物中所代表的菜鸟节肢动物的系统发育，以评估近海海洋生物对寒武纪环境扰动的响应。由于仅对一部分鼻鳍类动物了解软解剖结构，因此骨骼外形态已被证明很重要。周小姐虫和纳罗虫（Naraoia）在形态上通过后盾长度/宽度和前盾长度/后盾长度来区分。形态计量学也已被用来加强对某些神秘的类纳洛伊德生物种类的识别并修改地层范围。修改后的naraoiid发展史表明周小姐虫作为一个单亚属，前者属伪纳罗虫内筑巢纳罗虫并且是同义词，并且Liwiinae亚科的系统位置和状态对字符权重很敏感。10种Naraoiidae物种分布在2系列–苗岭边界，所有naaraoiid谱系起源于BST主窗口。在整个系列2灭绝中，外层架类鱼类的持续存在表明，在环境压力时期，更深的近海海洋环境具有对灭绝的抵抗力。这项研究为BST社区的庇护提供了新的经验支持，这可能有助于这些生物群中生物分类的寿命和广泛的地理分布。