摘要：SummaryMimicry is ubiquitous in nature, yet understanding its origin and evolution is complicated by the scarcity of exceptional fossils that enable behavioral inferences about extinct animals. Here we report bizarre true bugs (Hemiptera) that closely resemble beetles (Coleoptera) from mid-Cretaceous amber. The unusual fossil bugs are described asBersta vampiricagen. et sp. nov. andBersta coleopteromorphagen. et sp. nov. and are placed into a new family, Berstidae fam. nov. The specialized mouthparts of berstids indicate that they were predaceous on small arthropods. Their striking beetle-like appearance implies that they were either involved in defensive mimicry or mimicked beetles to attack unsuspecting prey. The latter would represent the first case of aggressive mimicry in the invertebrate fossil record. These findings enrich our understanding of the paleoecological associations and extinct behavioral strategies of Mesozoic insects.Graphical AbstractDisplay OmittedHighlights•A new family of beetle-mimicking bugs is described from Cretaceous amber•Berstidae were aggressive or defensive mimics of polyphagan beetles•They are one of the earliest mimics in the fossil record of insects•The discovery points at a high ecological complexity in mid-Cretaceous rainforestsEntomology; Evolutionary Biology; Systematics; Phylogenetics; Paleobiology
