Yandusaurus is a genus of herbivorous basal euornithopod dinosaur from the Bathonian age (middle Jurassic, approximately 169 to 163 Ma) of China.

A fast-moving biped, Yandusaurus had four toes on each foot and five fingers on each hand. It had large eyes as shown by the curved jugal. The teeth, showing a unique pattern of parallel vertical ridges compared by Chinese researchers to the fingers of the hand of Buddha statues, are very asymmetrical in that the inner side is strongly worn down. The fifteen maxillary teeth are largest in the middle and overlap.

When indicating the size of Yandusaurus many sources give that of Hexinlusaurus, the previous Y. multidens, the (all juvenile) specimens of which are sixty centimetres (two feet) to 1.6 metres (5 ft) in length, and weighed around seven kilograms (fifteen lb). Yandusaurus hongheensis was however considerably larger than these exemplars: He estimated the body length at three metres, Peng at 3.2 metres; in 2010 G.S. Paul gave an estimation of 3.8 metres length and a weight of hundred forty kilogrammes.

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Fact file

  • Pronounced: yen-doo-sore-us
  • Meaning of name: Yandu lizard
  • Length: 3m
  • Diet: herbivorous
  • When it lived: Mid Jurassic
    (169 – 159 million years ago)
  • Found in: Peoples Republic of China

Taxonomic details

  • Taxonomy: Dinosauria, Ornithischia, Genasauria, Cerapoda, Ornithopoda, Euornithopoda, Yandusaurus
  • Named by: He (1979)
  • Type species: hongheensis