Genus: Mierasaurus ROYO-TORRES, UPCHRUCH, KIRKLAND, DeBLIEU, FOSTER, COBOS & ALCALA, 2017
Etymology: In honor of Bernardo de Miera y Pacheco, Spanish cartographer and chief scientist for the 1776 Dominguez-Escalante Expedition: the first European Scientist to enter what is now Utah, and Greek, sauros, "lizard."

Species: bobyoungi ROYO-TORRES, UPCHRUCH, KIRKLAND, DeBLIEU, FOSTER, COBOS & ALCALA, 2017
Etymology: It honor of Robert Young, for the importance of his underappreation on the Early Cretaceous of Utah.

Holotype: UMNH.VP.26004

Locality: Doelling's Bowl bonebed, UMNH VP.LOC.1208 (Utah locality. 42Gr0300v), Grand County, Southeastern Utah.

Horizon: Lower Yellow Cat Member, Cedar Mountain Formation.

Biostratigraphy:

Age: Buffalogapian age, Barremian Stage, Lower Gallic Subepoch, Early Cretaceous Epoch, Early Cretaceous.

Material: Diarticulated cranial and postcranial elements, jaws, teeth, atlas, 8 cervical vertebrae, 11 cervical ribs, 11 dorsal vertebrae, 6 dorsal ribs, 6 sacral ribs, 15 caudal vertebrae, 2 chevrons, right scapula and partial left scapula, left radius, left ulna, left manus, complete pelvic elements, both femora, left tibia, left fibula left astragalus and left pes.

Referred material:

UMNH.VP.26010: Dentary of a juvenile.

UMNH.VP.260111: Femur of a juvenile.