Irritator is a genus of spinosaurid dinosaur that lived in the early Cretaceous Period (Albian stage), around 110 million years ago. Current estimations indicate a length of 8 meters (26 feet). In 2010, Gregory S. Paul gave lower estimations of 7.5 metres and one tonne. It was found in Brazil. Irritatorwas a theropod with an unusually shaped crest at the rear of its head, and most likely consumed fish.

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Fact file

  • Pronounced: irr-it-ate-or
  • Meaning of name: irritator
  • Length: 6.5m
  • Diet: carnivorous
  • When it lived: Early Cretaceous
    (112 – 99 million years ago)
  • Found in: Brazil

Taxonomic details

  • Taxonomy: Dinosauria, Saurischia, Theropoda, Neotherapoda, Tetanurae, Spinosauroidea, Spinosauridae, Spinosaurinae, Irritator
  • Named by: Martill, Cruickshank, Frey, Small and Clarke (1996)
  • Type species: challengeri