Open Paleo

Huehuecanauhtlus

Ramírez-Velasco et al., 2012 UE-UE-CANA-UHh-TLUS

From Nahuatl 'huehuetl' meaning 'ancient' and 'canauhtli' meaning 'duck', giving 'ancient duck', in reference to its hadrosauroid (duck-billed) affinities; the specific name tiquichensis honors the town of Tiquicheo, Michoacán.

85.7–83.6 million years ago Santonian, Late Cretaceous
Late Cretaceous stages

Huehuecanauhtlus is a genus of hadrosauroid dinosaur known from the Late Cretaceous (Santonian stage) of Michoacán, western Mexico. It contains a single species, Huehuecanauhtlus tiquichensis.

Diagnosis

  1. Two teeth exposed on occlusal plane of rostral third and posterior third of dentary and maxilla respectively
  2. Seven sacral vertebrae
  3. Tall neural spines of posterior vertebrae 3.5 to 4 times taller than corresponding centra
  4. Supraacetabular process 75% length of central iliac plate with apex above posteroventral corner of ischiac tuberosity
  5. Short and trapezoidal postacetabular process less than 80% length of iliac central plate
  6. Extremely deflected preacetabular process with angle less than 130° to horizontal plane
  7. Very deep concave profile of dorsomedial margin of iliac plate adjacent to supraacetabular process

Species

Huehuecanauhtlus tiquichensis Ramírez-Velasco et al., 2012

Type species

Named for the town of Tiquicheo in Michoacán, Mexico, honoring the generosity and hospitality of its people during fieldwork.

Holotype
IGM 6253 , Instituto de Geología, Universidad Nacional Autónoma de México
Material
Fragmentary skull and postcrania including partial left maxilla, dentary fragment, four cervical vertebrae (including axis), nine dorsal vertebrae, four dorsal neural spines, one dorsal diapophysis, five right and seven left dorsal ribs, seven sacral neural spines and diapophyses, caudal vertebrae, two caudal neural spines, eight ossified tendons, left and right partial ilium and pubis
Horizon
Cutzamala Formation, Santonian, Late Cretaceous , 85.7–83.6 million years ago
Locality
Barranca Los Bonetes, Michoacán, Mexico

References

  1. Ramírez-Velasco, A. A.; Benammi, M.; Prieto-Márquez, A.; Ortega, J. A.; Hernández-Rivera, R. (2012). Huehuecanauhtlus tiquichensis, a new hadrosauroid dinosaur (Ornithischia: Ornithopoda) from the Santonian (Late Cretaceous) of Michoacán, Mexico. Canadian Journal of Earth Sciences 49(2): 379-395. Canadian Science Publishing. doi:10.1139/e11-062 ramírez-velasco2012a
  2. Paul, G. S. (2024). The Princeton Field Guide to Dinosaurs (3rd ed.). Princeton University Press.

    Source of the appearance features.

    paul2024a
  3. Ramírez-Velasco, A. A. (2022). Phylogenetic and biogeography analysis of Mexican hadrosauroids. Cretaceous Research 138: 105267. Elsevier BV. doi:10.1016/j.cretres.2022.105267

    Supplies the Cutzamala Formation name for beds the describing paper leaves unnamed.

    ramírez-velasco2022a