Genus: Tethysaurus BARDET, PEREDA SUBERBIOLA, & JALIL, 2003b
Etymology: From Theys, goddess of the Sea in Greek mythology and Greek, sauros, "lizard."
= Genus: Nova BARDET, PEREDA SUBERBIOLA & JALIL, 2003a

Species: nopcsai BARDET, PEREDA SUBERBIOLA & JALIL, 2003b
Etymology: In honor of the Hungarian palaeontologist Baron Ferenc Nopcsa, for his pioneer studies on Adriatic aquatic squamates.

Holotype: MNHN GOU1

Locality: Near Goulmima, Er-Rachidia Province, Southern Morocco.

Horizon: Unit 4.

Biostratigraphy:

Age: Early Turonian Stage, Upper Gallic Formation, Lower Gulf Epoch, Late Cretaceous.

Material: A nearly complete articulated skull and mandible.

Referred material:

MNHN GOU2: Incomplete disarticulated skull and mandible.

MNHN GOU3: Partial skeleton including mostly disarticulated cranial, vertebral and appendicular bones.

ALLEMAND, POLCYN, HOUSSAYE, VINCENT, LOPEZ-AGUIRRE & BARDET, 2024

SMU 76335, 75486: Fragmetnary skulls.