Eleven-year-old Jacob Walen from the Netherlands looks at a reconstructed skull of Torvosaurus at Lourinha museum in Lourinha, near Lisbon August 2, 2008. Walen found an original jaw bone of a dinosaur in Lourinha on July 27, 2003. Portuguese paleontologists presented a reconstructed skull of Torvosaurus, a giant prehistoric dinosaur they say is the largest known terrestrial predator of the Jurassic Period. Reconstructed from parts of a cranium, including a jaw bone with a 5.1 inch (13 cm) long blade-like tooth, found in 2003 near Lourinha in central-western Portugal, the skull measures 4.6 feet (1.4 metres) in length -- bigger than an earlier Torvosaurus find made in the United States in the 1970s. The species roamed the earth about 150 million year ago, according to the New University of Lisbon.