Lourinhanosaurus, meaning “Lourinhã lizard” (from the Lourinhã Formation), is a genus of dinosaur from the Kimmeridgian/Tithonian age of the Late Jurassic Period. It was first discovered in Portugal in 1982, but was not described until 1998 by Portuguese paleontologist
Octávio Mateus. The only known species, L. antunesi, is named in honor of paleontologist Miguel Telles Antunes. It is known from a partial skeleton. Around 100 eggs were found in 1993 at a nearby beach that were assigned to L. antunesi.

Lourinhanosaurus was a large carnivore. The specimen found was a young adult measuring 14.75 feet in length and weighing approximately 353 pounds. A full grown adult would have been about 26.25 feet long. It would have taken about 10 years for it to reach that size.

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