2:40newsAugust 10, 2018Teacher discovers tooth from extinct mega-shark The Australian teacher and fossil enthusiast found teeth almost three-inches in length that belong to an extinct species, the great jagged narrow-toothed shark.Up Next in newsGirl attacked by shark in shallow waterAugust 8, 2018Massachusetts beaches shut down after great white shark sightingsAugust 6, 2018Stolen shark heads home to Texas aquariumJuly 31, 2018