Genus: Enigmacursor MAIDMENT & BARRETT, 2025
Etymology: Latin, enigma, “puzzle or mystery”, in reference to the convoluted taxonomic history of small-bodied ornithischians from the Morrison Formation, and Latin,cursor, “runner”, in reference to the cursorial morphology of the elongated hind limb and pes.

Species: mollyborthwickae MAIDMENT & BARRETT, 2025
Etymology: In honor of Molly Borthwick, whose generous donation allowed the NHMUK to acquire the specimen.

Holotype: NHMUK PV R 39000

Locality: Skull Creek Estates, 40°15'41"N, 108°43'38"W, Moffat County, Colorado.

Horizon: Morrison Formation.

Biostratigraphy:

Age: Kimmeridigian-Tithonian Stage, Malm Epoch, Late Jurassic.

Material: 3 teeth, 3 cervical, 22 dorsal, 2 dorsosacral and 5 caudal vertebrae, 10 ribs, 4 chevrons, right sternum, both scapulae, both humeri, both radii, both ulnae, 3 metacarpals, left ilium, right ischium, right ischium, right pubis, both femora, both tibiae, both fibulae, right astragalus and both pedes.