Abstract The Cambridge Greensand Member (lower Cenomanian: Upper Cretaceous) has yielded a diverse fauna of terrestrial and marine tetrapods, whose remains are largely reworked from the underlying Gault Formation (upper Albian: Lower Cretaceous). Here, we re-describe two of the non-avian dinosaur taxa named from this unit, ‘Eucercosaurus tanyspondylus’ Seeley, 1879 and ‘Syngonosaurus macrocercus’ Seeley, 1879, both of which have been referred to as either ankylosaurs or ornithopods but whose validity has not been rigorously assessed for over a century. Both taxa are interpreted as the remains of iguanodontian dinosaurs but possess no clear diagnostic features. Nevertheless, although ‘Eucercosaurus’ and ‘Syngonosaurus’ are nomina dubia they do indicate that iguanodontians were common components of the Cambridge Greensand tetrapod fauna and, alongside ‘Trachodon cantabrigiensis’ Lydekker, 1888, represent an important datum for understanding iguanodontian distributions during the mid-Cretaceous.

中文翻译：

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来自英国剑桥格林沙的非鸟类恐龙“Eucercosaurus tanyspondylus”和“Syngonosaurus macrocercus”的修订版

摘要 Cambridge Greensand 段（下森诺曼阶：上白垩纪）产生了多种陆生和海洋四足动物群，其遗骸大部分是从下伏的 Gault 地层（上阿尔比安：下白垩纪）改造而来的。在这里，我们重新描述了从这个单位命名的两个非鸟类恐龙分类群，“Eucercosaurus tanyspondylus”Seeley，1879 年和“Syngonosaurus macrocercus”Seeley，1879 年，两者都被称为甲龙或鸟足类，但它们的有效性一个多世纪以来一直没有经过严格的评估。这两个分类群都被解释为禽龙类恐龙的遗骸，但没有明确的诊断特征。尽管如此，虽然“Eucercosaurus”和“Syngonosaurus”是怀疑的名称，但它们确实表明禽龙类是剑桥绿沙四足动物群的常见组成部分，并且，