Genus: Miragaia MATEUS, MAIDMENT & CHRISTIANSEN, 2009
Etymology: Miragaia, after the locality and geological unit of the same name.

Species: longicollum MATEUS, MAIDMENT & CHRISTIANSEN, 2009
Etymology: Latin, longus, 'long', and Latin, collum, 'neck'; in reference to its long neck. In addition, the stem Mira-can be read as the feminine form of Latin mirus, meaning wonderful, while Gaia is the Greek goddess of the Earth, so the name also means 'Wonderful goddess of the Earth'.

Holotype: ML 433

Locality: Close to the Miragaia at the municipality of Lourinha, Estremadura Province, West coast of Portugal.

Horizon: Miragaia Unit, Sobral Formation, Lourinha Group.

Biostratigraphy:

Age: Upper Kimmeridgian-Lower Tithonian Stage, Middle-Upper Malm Epoch, Late Jurassic.

Material: Nearly complete anterior half of a skeleton, right premaxilla, partial left maxilla, left nasal, right postorbital, right and left angulars, 15 cervical vertebrae (atlas and axis absent) with associated ribs, 2 dorsal vertebrae, both coracoids, scapulae, humeri, radii and ulnae, 1 metacarpal, 3 phalanges, 12 rib fragments, 1 cheveron, 1 dermal spine and 13 plates.

Referred material:

ML 433-A: 2 dorsla centra, 3 dorsal neural arches a right pubis, and left ilium of a juvenile.

Note: May belong to a different genus.