Open Paleo

Bicentenaria

Novas et al., 2012 bi-sen-ten-ahr-ee-uh

From Latin bicentenaria meaning 'two hundred year anniversary', named after the 200th anniversary of the 1810 May Revolution in Argentina.

100.5–93.9 million years ago Cenomanian, Late Cretaceous
Late Cretaceous stages

Bicentenaria is an extinct genus of carnivorous coelurosaurian theropods which lived during the early Late Cretaceous (Cenomanian) Candeleros Formation of Argentina. It contains the type species, B. argentina.

Diagnosis

  1. Premaxillary teeth with mesial denticles only at the base of the crown
  2. Quadratojugal with a rostral process two times longer than the dorsal process
  3. Quadrate with lateral condyle much larger than the medial one
  4. Surangular with a raised dorsal margin trapezoidal-shaped in lateral profile
  5. Retroarticular process dorsoventrally depressed, transversely wide, and spoon-shaped
  6. Manual unguals of external digits bearing proximal dorsal lips

Species

Bicentenaria argentina Novas et al., 2012

Type species

Named for Argentina, the country where the fossils were discovered.

Holotype
MPCA-PV 865 , Museo provincial de Cipolletti "Carlos Ameghino"
Material
Caudal half of skull in articulation with the lower jaws.
Horizon
upper Candeleros Formation, Cenomanian, Late Cretaceous , 100.5–93.9 million years ago
Locality
East shore of Ezequiel Ramos Mexía Reservoir, Río Negro, Argentina

References

  1. Novas, F.; Ezcurra, M.; Agnolin, F.; Pol, D.; Ortiz, R. (2012). New Patagonian Cretaceous theropod sheds light about the early radiation of Coelurosauria. Revista del Museo Argentino de Ciencias Naturales 14: 57-81. Museo Argentino de Ciencia Naturales. doi:10.22179/revmacn.14.372 novas2012a
  2. Paul, G. S. (2024). The Princeton Field Guide to Dinosaurs (3rd ed.). Princeton University Press.

    Source of the mass estimate.

    paul2024a
  3. Jones, B. (2026). The Princeton Encyclopedia of Dinosaurs: Theropods. Princeton University Press.

    Source of the hip height estimate.

    jones2026c