Branched, sinusoidal burrows assigned to Sinusichnus cf. seilacheri Knaust et al. 2016; occur in Upper Ordovician (Hirnantian) carbonates on Anticosti Island. These are abundant and monospecific at the base of the Oncolite Bed of the uppermost Ellis Bay Formation, marking a regional discontinuity surface during the multiphase Ordovician mass‐extinction event. In contrast to Mesozoic and Cenozoic records of Sinusichnus, commonly attributed to the activity of decapod and isopod crustaceans, the burrow systems from Anticosti Island were probably produced by other arthropods of unknown affinity. A combined dwelling, locomotion and feeding behaviour of their trace maker is assumed. This is the oldest record of the ichnogenus Sinusichnus, previously only known since the Triassic, and its first evidence from North America.

中文翻译：

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来自加拿大东部安蒂科斯蒂岛上奥陶纪的微量化石Sinusichnus

分配给Sinusichnus的分支正弦凹洞cf. seilacheri Knaust酒店等。2016; 发生在Anticosti岛上的奥陶纪（Hirnantian）碳酸盐岩中。这些物质在最上层的Ellis湾组的Oncolite床底部具有丰富的单一特征，标志着奥陶纪多相大灭绝事件中区域的不连续面。与通常归因于十足动物和异足动物甲壳类动物活动的中华绒螯蟹的中生代和新生代记录相反，安蒂科斯蒂岛的洞穴系统可能是由其他未知亲和力的节肢动物产生的。假定其追踪者的居住，运动和进食行为相结合。这是鱼鳞的最古老的记录Sinusichnus，以前仅在三叠纪以来才知道，它的第一个证据来自北美。