After discovering spider webs in the vents, Mazda is recalling more than 50,000 Mazda6 cars from the 2009-2010 model years in the United States and an additional 15,000 vehicles in Canada, Mexico and Puerto Rico. The company said yesterday a spider could

weave a web in a vent connected to the fuel tank system and clog up the tank’s ventilation. Pressure on the fuel tank could lead to a crack, causing fuel leakage and the risk of a fire. Mazda said it was unaware of any fires, injuries or crashes in the vehicles. Mazda spokesman Jeremy Barnes said dealers had identified 20 cases in which spider webs were found in the vents. The webs were linked to yellow sac spiders, Barnes said, but it was unclear why they were crawling into the Mazda6 rather than other vehicles.