Species: gracilis EVANS & MILNER, 1996
Etymology: Latin, gracilis, "lightly built, gracile."

Holotype: LH 928061a-b

Locality: Las Hoyas fossil site, La Cierva Township, 20 km east of Cuenca, in the Castellan Branch of the Iberian Range, Province of Cuenca, Spain.

Horizon: Calizas de La Huerguina Formation.

Biostratigraphy:

Age: Upper Hauterivian Stage, Late Neocomian subepoch-Lower Berremian Stage, Early Gallic subepoch, Early Cretaceous Epoch, Early Cretaceous.

Material: Counterparts of a skeleton missing only part of the tail.

Paratypes:

LH 2850a-b: Counterparts of an almost complete skeleton.

LH 6021: Counterparts of an almost complete skeleton.

MC 6a-b: Counterparts of a skeleton, skull partialy disarticulated but dentition and vertebral column well preserved.

Referred material:

LH 928001a-b: Counterparts of a complete but poorly preserved skeleton.

LH-ADR unnumbered: Couterparts of anterior half of a skeleton.