This picture taken on January 1, 2016 and released by Curtin University on April 30, 2018 shows the world's oldest known spider which has died at the ripe old age of 43 after being monitored for years during a long-term population study in Perth, Australia. Pic/AFP

The world's oldest known spider has died at the ripe old age of 43 after being monitored for years during a long-term population study in Australia, researchers said on Monday.