Genus: Itapeuasaurus LINDOSO, MEDEIROS de SOUZA CARVALHO, PEREIRA, MENDES, IORI, SOUSA, ARCANJO & SILVA, 2023
Etymology: In reference to Itapeau Beach, Brazil and Greek, sauros, "lizard."

Species: cajapioensis LINDOSO, MEDEIROS de SOUZA CARVALHO, PEREIRA, MENDES, IORI, SOUSA, ARCANJO & SILVA, 2023
Etymology: In reference to Cajapio Municipality, Brazil.

Holotype: UFMA.1.10.1960

Locality: Itapeau Beach, Cajapio Municipality, northern Maranhao State, Sao Luis Basin, Brazil.

Horizon: Alcantara Formation.

Biostratigraphy:

Age: Cenomanian Stage, Late Gallic Subepoch, Early Gulf Epoch, Middle Cretaceous.

Material:

UFMA.1.10.1960-01: An incomplete dorsal neural arch.

UFMA.1.10.1960-03, 04, 05: 3 anterior caudal vertebrae.

UFMA.1.10.1960-07, 08: 2 middle caudal vertebrae.

PAratype:

UFMA.1.10.1960-02: A summit dorsal neural spine.

UFMA.1.10.1060-06: An anterior caudal vertebra.

UFMA.1.10.1960-10, -11: 2 chevrons.

UFMA.1.10.160-09: An incomplete ischium.