A relatively uncommon arthropod of the Waukesha lagerstätte, Parioscorpio venator, is redescribed as an arthropod bearing a combination of characters that defy ready classification. Diagnostic features include sub‐chelate ‘great appendages’, a lack of antennae, multiramous anterior trunk appendages, filamentous fan‐like rear trunk appendages, and apparently thin and poorly preserved pleural fields. Phylogenetic analysis resolves this organism as basal to crown‐group Mandibulata and Chelicerata, but its exact placement is inconclusive. Thus, we compare its morphology to several stem groups of arthropods in a discussion of its plausible taxonomic affinities. The examined specimens are probably carcasses and preserve a variety of soft‐tissue details, including muscle blocks in the head, eyes and eye facets, likely ventral nerve cords, a central gut tract and trunk legs with multiple filamentous elements organized into stiff bundles. The preservation habits of P. venator are characterized and compared to previous assessments of Waukesha lagerstätte taxa. Four preservation habits are observed: a phosphatized habit showing flattened to partly three‐dimensional mineralization in francolite; a mouldic habit largely left behind by removed francolite that shows no carbon enrichment despite a darkened colour; sheet‐like or speckled carbonaceous compressions; and scattered pyrite crystals. This redescription highlights both the palaeobiological value of ‘small’ lagerstätten typical of the middle Palaeozoic and the caution that must be taken when interpreting their more enigmatic constituents.

中文翻译：

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比蝎子更陌生：重新评估Parioscorpio venator，这是来自Llandoverian WaukeshaLagerstätte的有问题的节肢动物

Parioscorpio呼吸机Waukeshalagerstätte的一种较不常见的节肢动物，被重新定义为节肢动物，带有不符合现成分类标准的字符组合。诊断特征包括亚螯合的“大附肢”，缺乏触角，多发性前躯干附件，丝状扇状后躯干附件以及明显稀薄且保存不良的胸膜区域。系统发育分析将这种生物解析为冠群下颌和虎尾草的基础，但其确切位置尚无定论。因此，在对其合理的分类学亲和力的讨论中，我们将其形态与节肢动物的几个茎组进行了比较。被检查的标本可能是尸体，并保留了各种软组织的细节，包括头部，眼睛和眼小面的肌肉阻滞，可能的腹神经索，中央肠道和躯干腿，有多个丝状元素组织成坚硬的束。的保存习惯对P. venator进行了表征，并与Waukeshalagerstätte分类群的先前评估进行了比较。观察到了四种保存习惯：磷化习惯在方沸石中显示为扁平化至部分三维矿化；脱模的方沸石在很大程度上留下了发霉的习性，尽管颜色变暗，但仍未显示出碳富集；片状或有斑点的碳质压缩; 和散布的黄铁矿晶体。这种重新描述既突出了古生代中期典型的“小”拉格斯塔滕的古生物学价值，又强调了解释其更神秘的成分时必须谨慎的地方。