Enigmacursor

Enigmacursor (meaning "puzzle runner") is an extinct genus of neornithischian dinosaur from the Late Jurassic Morrison Formation of Colorado, United States. The type species is Enigmacursor mollyborthwickae.

== Discovery and naming == The holotype specimen, NHMUK PV R 39000, was discovered between 2021 and 2022 in Moffat County, Colorado by private company Dinosaurs of America, LLC. and acquired by the Natural History Museum, London (NHM) in 2024. It represents a three-dimensionally preserved partial postcranial skeleton with associated teeth. left|thumb|Speculative life restoration It was described as a new genus and species by Susannah Maidment & Paul Barrett in 2025. The generic name, Enigmacursor, comes from the word enigma, referring to the taxonomic confusion of Morrison Formation neornithischians such as Nanosaurus, and the Latin word cursor, meaning "runner", after its cursorial hindlimbs. The specific name, mollyborthwickae, honors Molly Borthwick, who donated the funds for the acquisition of the specimen by the NHM.