Batrachochytrium dendrobatidis, (bə-TRAY-koh-KIT-ri-um DEN-droh-bə-teye-dis) also known as Bd or the amphibian chytrid fungus, that causes the disease chytridiomycosis in amphibians. In the decade after it was first discovered in 1998, the disease devastated amphibian populations around the world, in a global decline towards multiple extinctions, part of the Holocene extinction. A recently described second species, B. salamandrivorans, also cause chytridiomycosis and death in salamanders.