Segnosaurus (‘slow lizard’) is a genus of herbivoroustheropod dinosaur belonging to the Therizinosauridae from the Cretaceous of Mongolia.

Segnosaurus was a rather large therizinosaurid. In 2010 Gregory S. Paulestimated the body length at 6 metres (19.5 ft), the weight at 1.3 tonnes. Segnosaurus had an elongated head, large clawed hands, a somewhat elevated torso, a broad strong pelvis, stocky legs and a short tail.

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Fact file

  • Pronounced: SEG-no-SORE-us
  • Meaning of name: slow lizard
  • Length: 4m
  • Diet: carnivorous
  • When it lived: Late Cretaceous
    (97 – 88 million years ago)
  • Found in: Mongolia

Taxonomic details

  • Taxonomy: Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Avetherapoda, Coelurosauria, Tyrannoraptora, Maniraptoriformes, Maniraptora, Therizinosauroidea, Therizinosauridae, Segnosaurus
  • Named by: Perle (1979)
  • Type species: galbinensis