Genus: Transylvanosaurus AUGUSTIN, BASTIAANS, DUMBRAVA & CSIKI-SAVA, 2022
Etymology: Latin, trans, "across", Latin, siva, "forest" and Greek, sauros, "lizard," 'Lizard from across the forest'. The genus is named after Transylvania, the historical region that includes the Hateg Basin and the type locatliy of the genus.

Species: platycephalus AUGUSTIN, BASTIAANS, DUMBRAVA & CSIKI-SAVA, 2022
Etymology: Greek, platys, "wide" and Greek, cephalos, "head". The specific name refers to teh exceptinally wide skull of the new dniosaur compared with that of other rhabdondontids.

Holotype: LPB (FGGUB R2070

Locality: Barbat River Valley section, near Pui, eastern Hateg Basin, Hunedoara County, Romania.

Horizon: 'Barbat Formation' or 'pui beds'.

Biostratigraphy:

Age: Middle-early to late Maastrichtian boundary, Maastrichtian Stage, Upper Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Articulated basicranium composed of the basioccipital, the exoccipital-opisthotic complexes, the basisphenoid-parasphenoid complex, the prootic and laterosphenoid and the articulated left and right frontals.