Open Paleo

Equijubus

You et al., 2003 ee-kwee-joo-bus

From Latin equus (horse) + juba (mane): 'horse mane', after the Mazong (horse mane) Mountain region in Gansu, China, where it was discovered.

113.2–100.5 million years ago Albian, Early Cretaceous
Early Cretaceous stages

Equijubus is a genus of herbivorous hadrosauroid dinosaur from the Early Cretaceous (Albian stage) of northwestern China.

Diagnosis

  1. Unique finger-like process extending dorsally from the rostral process of the jugal to the lacrimal.
  2. Very large lower temporal fenestra, twice the size of the orbit.
  3. Long lacrimal with a rostroventral process positioned above the dorsal margin of the maxilla.
  4. Dentary teeth lacking a median primary ridge on the crown of the enamelled lingual surface.

Species

Equijubus normani You et al., 2003

Type species

Named for British paleontologist David B. Norman, in honor of contributions to ornithopod research.

Holotype
IVPP V12534 , Institute of Vertebrate Paleontology and Paleoanthropology
Material
Complete skull (57 cm in length, laterally compressed) with articulated lower jaw, plus incomplete postcranium.
Horizon
middle Zhonggou Formation, Albian, Early Cretaceous , 113.2–100.5 million years ago
Locality
Gongpoquan Basin, Gansu, China Suarez and colleagues (2018) measured no sections in the Gongpoquan Basin, and You and colleagues (2018) find the Mazongshan and Jiuquan beds cannot be easily correlated, so the unit is a working hypothesis.

References

  1. You, H. L.; Luo, Z. X.; Shubin, N. H.; Witmer, L. M.; Tang, Z. L.; Tang, F. (2003). The earliest-known duck-billed dinosaur from deposits of late Early Cretaceous age in northwest China and hadrosaur evolution. Cretaceous Research 24(3): 347-355. Elsevier BV. doi:10.1016/s0195-6671(03)00048-x you2003c
  2. You, H. L.; Li, D. Q.; Dodson, P. (2014). Gongpoquansaurus mazongshanensis (Lü, 1997) comb. nov. (Ornithischia: Hadrosauroidea) from the Early Cretaceous of Gansu Province, northwestern China. Hadrosaurs 73-76. Indiana University Press.

    Places the Gongpoquan Basin dinosaur beds in the Zhonggou Formation of the Xinminpu Group, refining the describing paper's group-rank horizon.

    you2014a
  3. Paul, G. S. (2024). The Princeton Field Guide to Dinosaurs (3rd ed.). Princeton University Press.

    Source of the appearance features.

    paul2024a
  4. Suarez, M. B.; Milder, T.; Peng, N.; Suarez, C. A.; You, H.; Li, D.; Dodson, P. (2018). Chemostratigraphy of the Lower Cretaceous dinosaur-bearing Xiagou and Zhonggou formations, Yujingzi Basin, northwest China. Journal of Vertebrate Paleontology 38(sup1): 12-21. doi:10.1080/02724634.2018.1510412 suarez2018a
  5. You, H.; Morschhauser, E. M.; Li, D.; Dodson, P. (2018). Introducing the Mazongshan Dinosaur Fauna. Journal of Vertebrate Paleontology 38(sup1): 1-11. Taylor and Francis. doi:10.1080/02724634.2017.1396995 you2018a