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Temporal range: Middle - Late Jurassic
Mighty Megalosaurus.png
Megalosaurus bucklandii
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Suborder: Theropoda
Family: Megalosauridae
Huxley, 1869
Type species
Megalosaurus bucklandii
Mantell, 1827
  • Eustreptospondylidae Paul, 1988
  • Streptospondylidae Kurzanov, 1989
  • Torvosauridae Jensen, 1985

Megalosauridae (Huxley, 1869) was a family of megalosauroid theropod dinosaurs that lived from the Middle Jurassic to the Mid-Cretaceous. Its name derives from the infamous and the first dinosaur to be scientifically studied, Megalosaurus. Some notable member species include Megalosaurus and Torvosaurus.

A mystery in a lost world

Megalosauridae is as mysterious as the dinosaur it was named after, in fact, it has been commonly used as a "wastebasket" group, with any unidentified species instantly classified as a Megalosauridae. This use was not liked by many scientists, which is why in 1985, James A. Jensen coined the term, Torvosauridae, though under official rules, the name change is not allowed.