Genus: Huehuecanuhtolus RAMIREZ-VELASCO, BENAMMI, PREITO-MARQUEZ, ORTEGA, & HERNANDEZ-RIVERA, 2012
Etymology: The generic name is composed of the nahuatl (group of dialects related to the Aztecan languages) words huehutel for "ancient" and canauhtli for "duck": in reference to its hadrosauroian affinities.

Species: tiquichensis RAMIREZ-VELASCO, BENAMMI, PREITO-MARQUEZ, ORTEGA, & HERNANDEZ-RIVERA, 2012
Etymology: In reerence to the town of Tiquicheon, honorign the generosity adn hospitality of its people during the fieldwork season.

Holotype: IGM 6253

Locality: Sixth fossiliferous spot, Barranca Los Bonetes, Tuzantla, Michoacan State, Mexico.

Horizon: Unnamed formation.

Biostratigraphy:

Age: Santonian Stage, Lower Senonian subepoch, Middle Gulf Epoch, Late Cretaceous.

Material: A partial left maxilla, dentary fragment, 4 cervical vertebrae (including the axis), 9 dorsal vertebrae, 4 dorsla neural spines, 1 dorsal diapophysis, 5 right dorsal ribs, 7 left dorsal ribs, 7 sacral neural spines, 7 sacral diapophysis, 1 caudal diapopohysis, 3 caudal vertebrae, 2 caudal neural spines, 8 fragmentary ossified tendons, left and right partial ilium, and left and right partial pubis from the 6th spot.

Note: 2 dorsal ribs adn a dorsal vertebra wiht pathologies; possible premortem or perimortem anteriro rib fracture, associated with a singualr sclerosis and costovertebrfal ankyloses which probably originated by spinal and rib osteomyelitis (RAMIREZ-VELASCO, MORALES-SALINAS, HERNANDEZ-RIVERA, & TANKJE, 2016.

Paratype: IGM 6254

Locality: Third fossiliferous spot, Barranca Los Bonetes, Tuzantla, Michoacan State, Mexico.

Horizon: Unnamed formation.

Biostratigraphy:

Age: Santonian Stage, Lower Senonian subepoch, Middle Gulf Epoch, Late Cretaceous.

Material: Fragment of left dentary, 2 teeth, and 1 cervical prezygapophysis of a smaller individual.