Trilobite malformations are often ascribed to failed predation and represent key evidence for Paleozoic arthropod predator–prey systems. A large number of malformed trilobites are known to Cambrian-aged deposits and have recently been discussed at length. Conversely, most post-Cambrian records are noted as anecdotal points within larger taxonomic works. To expand the consideration of post-Cambrian injured trilobites, we report two malformed Ogygiocarella debuchii specimens from the Middle Ordovician of Wales and a heavily malformed Spiniscutellum umbelliferum specimen from the Early Devonian of the Czech Republic. These specimens are considered to represent records of failed predation. In considering these specimens, we explore possible injury-making groups, in particular noting that S. umbelliferum was likely prey for multiple apex predators. Continued examination of injured trilobites represents the main direction for uncovering how this iconic group of biomineralised arthropods interacted with higher tropic levels within Paleozoic foodwebs.

三叶虫畸形通常归因于捕食失败，代表了古生代节肢动物捕食者-猎物系统的关键证据。寒武纪沉积物中已知有大量畸形的三叶虫，并且最近对其进行了详细讨论。相反，大多数后寒武纪记录在较大的分类学著作中被视为轶事点。为了扩大对后寒武纪损伤三叶虫的考虑，我们报告了来自威尔士中奥陶世的两个畸形Ogygiocarella debuchii标本和来自捷克共和国早泥盆世的严重畸形Spiniscutellum umbelliferum标本。这些标本被认为代表了捕食失败的记录。在考虑这些标本时，我们探索了可能造成伤害的群体，特别是注意到S. umbelliferum可能是多种顶级掠食者的猎物。继续检查受伤的三叶虫代表了揭示这一标志性的生物矿化节肢动物群如何与古生代食物网中较高热带水平相互作用的主要方向。