Genus: Trinisaura CORIA, MOLY, REGUERO, SANTILLANA & MARENSSI, 2013
Etymology: In honor of Dr. Trinidad "Trini" Diaz, for her pioneer geologic studies on the Antarctic Peninsula, and Greek, sauros, "lizard."

Species: santamartaensis CORIA, MOLY, REGUERO, SANTILLANA & MARENSSI, 2013
Etymology: In reference to Santa Marta Cove, James Ross Island, Antarctica, where the holotype was found.

Holtype: MLP08-III-1-1

Locality: Santa Marta Cove, James Ross Island, Antarctica.

Horizon: Lower levels of the Snow Hill Island Formation.

Biostratigraphy:

Age: Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Disarticulated and partial skeleton, that includes one incomplete dorsal vertebra, three sacral centra, seven caudal vertebrae, two incomplete dorsal rib shafts, one proximal haemal arch, incomplete right scapulocoracoid, incomplete right humerus, two metacarpals, both ilia, right pubis, right ischium, right femur, right distal tibia, incomplete metatarsal III, first phalanx of pedal digit III, two phalanges of pedal digit IV, adn indeterminate fragments.