Open Paleo

Probactrosaurus

Rozhdestvensky, 1966 proh-BAK-tro-SAWR-us

From Latin pro (before) and the genus name Bactrosaurus; meaning "before Bactrosaurus", reflecting the hypothesis that it was the direct ancestor of Bactrosaurus.

121.4–100.5 million years ago Aptian–Albian, Early Cretaceous
Early Cretaceous stages

Probactrosaurus is an extinct genus of basal hadrosauroid iguanodontian dinosaur that lived in China during the Early Cretaceous period.

Species

Probactrosaurus gobiensis Rozhdestvensky, 1966

Type species

Named for the Gobi Desert of Inner Mongolia, where the holotype was discovered.

Holotype
PIN 2232/1 , Paleontological Institute, Russian Academy of Sciences
Horizon
Miaogou Formation, Aptian–Albian, Early Cretaceous , 121.4–100.5 million years ago
Locality
Maortu, Inner Mongolia, China

References

  1. Rozhdestvensky, A. K. (1966). Novye igyanodonti ie tsentrallinoy Asii. Phillogeneticheskye y taksonomicheskye veaimoothoshenia poednich Iguanodontidae y rannich Hadrosauridae [New iguanodonts from central Asia. Phylogenetic and taxonomic relationships of late Iguanodontidae and early Hadrosauridae]. Paleontologicheskii Zhurnal 1966(3): 103-116. rozhdestvensky1966a
  2. Jones, B. (2026). The Princeton Encyclopedia of Dinosaurs: Ornithischians. Princeton University Press.

    Source of the hip height estimate, and the appearance features.

    jones2026a