Deinosuchus is a lineage of giant (≥10 m) Late Cretaceous crocodylians from North America. These were the largest semiaquatic predators in their environments and are known to have fed on large vertebrates, including contemporaneous terrestrial vertebrates such as dinosaurs. Fossils have been found in units of Campanian age from northern Mexico to Montana in the west and Mississippi to New Jersey in the east. Three species have been named, and recent consensus suggests that they represent a single, widely ranging species. The authors studied newly collected material from western Texas and increased sampling from throughout North America to review species-level systematics of Deinosuchus and help refine its phylogenetic placement among crocodylians. Deinosuchus from eastern and western North America can be consistently differentiated and represent different species. A phylogenetic study is conducted including new character states. This work reinforces the identity of the ‘terror crocodile’ as an alligatoroid. Reference to the holotypes indicates that the generic name holder, Deinosuchus hatcheri, is extremely incomplete. As a result, the three known species of Deinosuchus cannot be differentiated. To ensure nomenclatural stability, the type species for Deinosuchus should be transferred to Deinosuchus riograndensis, a species known from multiple mostly complete individuals. Additionally, Deinosuchus rugosus is based on a holotype that is not diagnostic, and a new species, Deinosuchus schwimmeri, is named to encompass some specimens formerly assigned to D. rugosus.

Deinosuchus是来自北美的大型（≥10 m）晚白垩纪鳄族。这些是它们环境中最大的半水族捕食者，已知它们以大型脊椎动物为食，包括诸如恐龙的同期陆生脊椎动物。在从北部墨西哥到西部的蒙大拿州以及从东部到密西西比州到新泽西州的坎帕尼亚年龄单元中发现了化石。已经命名了三个物种，最近的共识表明它们代表一个单一的，范围广泛的物种。作者研究了得克萨斯州西部新采集的材料，并从整个北美增加了采样，以审查Deinosuchus的物种级系统，并帮助完善其在鳄鱼中的系统发育位置。狄氏鳄来自北美东部和西部的人可以一贯区分，并代表不同的物种。进行了系统发育研究，包括新的性状。这项工作加强了“恐怖鳄鱼”作为鳄鱼的身份。引用整型说明通用名称持有人Deinosuchus hatcheri非常不完整。结果，不能区分出迪诺氏菌的三种已知物种。为了确保命名的稳定性，应将Deinosuchus的类型种转移到Deinosuchus riograndensis中，该种从多个完全完整的个体中获知。此外，De该物种的基础是非诊断性的全基因型，而新物种Deinosuchus schwimmeri的名称则包含了以前归类于D. rugosus的一些标本。